diff --git a/Pipfile.lock b/Pipfile.lock
index bb0d7db..54d6d03 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -25,108 +25,181 @@
         },
         "babel": {
             "hashes": [
-                "sha256:af92e6106cb7c55286b25b38ad7695f8b4efb36a90ba483d7f7a6628c46158ab",
-                "sha256:e86135ae101e31e2c8ec20a4e0c5220f4eed12487d5cf3f78be7e98d3a57fc28"
+                "sha256:ab49e12b91d937cd11f0b67cb259a57ab4ad2b59ac7a3b41d6c06c0ac5b0def9",
+                "sha256:bc0c176f9f6a994582230df350aa6e05ba2ebe4b3ac317eab29d9be5d2768da0"
             ],
-            "version": "==2.7.0"
+            "index": "pypi",
+            "version": "==2.9.1"
+        },
+        "backports.entry-points-selectable": {
+            "hashes": [
+                "sha256:988468260ec1c196dab6ae1149260e2f5472c9110334e5d51adcb77867361f6a",
+                "sha256:a6d9a871cde5e15b4c4a53e3d43ba890cc6861ec1332c9c2428c92f977192acc"
+            ],
+            "markers": "python_version >= '2.7'",
+            "version": "==1.1.0"
         },
         "certifi": {
             "hashes": [
-                "sha256:e4f3620cfea4f83eedc95b24abd9cd56f3c4b146dd0177e83a21b4eb49e21e50",
-                "sha256:fd7c7c74727ddcf00e9acd26bba8da604ffec95bf1c2144e67aff7a8b50e6cef"
+                "sha256:78884e7c1d4b00ce3cea67b44566851c4343c120abd683433ce934a68ea58872",
+                "sha256:d62a0163eb4c2344ac042ab2bdf75399a71a2d8c7d47eac2e2ee91b9d6339569"
             ],
-            "version": "==2019.9.11"
+            "version": "==2021.10.8"
         },
-        "chardet": {
+        "charset-normalizer": {
             "hashes": [
-                "sha256:84ab92ed1c4d4f16916e05906b6b75a6c0fb5db821cc65e70cbd64a3e2a5eaae",
-                "sha256:fc323ffcaeaed0e0a02bf4d117757b98aed530d9ed4531e3e15460124c106691"
+                "sha256:e019de665e2bcf9c2b64e2e5aa025fa991da8720daa3c1138cadd2fd1856aed0",
+                "sha256:f7af805c321bfa1ce6714c51f254e0d5bb5e5834039bc17db7ebe3a4cec9492b"
             ],
-            "version": "==3.0.4"
+            "markers": "python_version >= '3'",
+            "version": "==2.0.7"
+        },
+        "distlib": {
+            "hashes": [
+                "sha256:c8b54e8454e5bf6237cc84c20e8264c3e991e824ef27e8f1e81049867d861e31",
+                "sha256:d982d0751ff6eaaab5e2ec8e691d949ee80eddf01a62eaa96ddb11531fe16b05"
+            ],
+            "version": "==0.3.3"
         },
         "docutils": {
             "hashes": [
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-                "sha256:a2aeea129088da402665e92e0b25b04b073c04b2dce4ab65caaa38b7ce2e1a99"
+                "sha256:686577d2e4c32380bb50cbb22f575ed742d58168cee37e99117a854bcd88f125",
+                "sha256:cf316c8370a737a022b72b56874f6602acf974a37a9fba42ec2876387549fc61"
+            ],
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'",
+            "version": "==0.17.1"
+        },
+        "filelock": {
+            "hashes": [
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-            "version": "==0.15.2"
+            "markers": "python_version >= '3.6'",
+            "version": "==3.3.1"
         },
         "idna": {
             "hashes": [
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-            "version": "==2.8"
+            "markers": "python_version >= '3'",
+            "version": "==3.3"
         },
         "imagesize": {
             "hashes": [
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-            "version": "==1.1.0"
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
+            "version": "==1.2.0"
+        },
+        "importlib-metadata": {
+            "hashes": [
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+        "importlib-resources": {
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+            "version": "==2.0.1"
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+            "version": "==21.0"
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-            "version": "==5.4.3"
+            "markers": "python_version >= '2.6'",
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-            "version": "==2018.11.26"
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
+            "version": "==2021.5.29"
         },
         "pipenv-to-requirements": {
             "hashes": [
@@ -136,47 +209,59 @@
             "index": "pypi",
             "version": "==0.8.2"
         },
+        "platformdirs": {
+            "hashes": [
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+            "markers": "python_version >= '3.6'",
+            "version": "==2.4.0"
+        },
         "pygments": {
             "hashes": [
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-            "version": "==2.4.2"
+            "markers": "python_version >= '3.5'",
+            "version": "==2.10.0"
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             "hashes": [
-                "sha256:4acadc9a2b96c19fe00932a38ca63e601180c39a189a696abce1eaab641447e1",
-                "sha256:61b5ed888beab19ddccab3478910e2076a6b5a0295dffc43021890e136edf764"
+                "sha256:c203ec8783bf771a155b207279b9bccb8dea02d8f0c9e5f8ead507bc3246ecc1",
+                "sha256:ef9d7589ef3c200abe66653d3f1ab1033c3c419ae9b9bdb1240a85b024efc88b"
             ],
-            "version": "==2.4.4"
+            "markers": "python_version >= '2.6' and python_version not in '3.0, 3.1, 3.2, 3.3'",
+            "version": "==2.4.7"
         },
         "pytz": {
             "hashes": [
-                "sha256:1c557d7d0e871de1f5ccd5833f60fb2550652da6be2693c1e02300743d21500d",
-                "sha256:b02c06db6cf09c12dd25137e563b31700d3b80fcc4ad23abb7a315f2789819be"
+                "sha256:3672058bc3453457b622aab7a1c3bfd5ab0bdae451512f6cf25f64ed37f5b87c",
+                "sha256:acad2d8b20a1af07d4e4c9d2e9285c5ed9104354062f275f3fcd88dcef4f1326"
             ],
-            "version": "==2019.3"
+            "version": "==2021.3"
         },
         "requests": {
             "hashes": [
-                "sha256:11e007a8a2aa0323f5a921e9e6a2d7e4e67d9877e85773fba9ba6419025cbeb4",
-                "sha256:9cf5292fcd0f598c671cfc1e0d7d1a7f13bb8085e9a590f48c010551dc6c4b31"
+                "sha256:6c1246513ecd5ecd4528a0906f910e8f0f9c6b8ec72030dc9fd154dc1a6efd24",
+                "sha256:b8aa58f8cf793ffd8782d3d8cb19e66ef36f7aba4353eec859e74678b01b07a7"
             ],
-            "version": "==2.22.0"
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4, 3.5'",
+            "version": "==2.26.0"
         },
         "six": {
             "hashes": [
-                "sha256:1f1b7d42e254082a9db6279deae68afb421ceba6158efa6131de7b3003ee93fd",
-                "sha256:30f610279e8b2578cab6db20741130331735c781b56053c59c4076da27f06b66"
+                "sha256:1e61c37477a1626458e36f7b1d82aa5c9b094fa4802892072e49de9c60c4c926",
+                "sha256:8abb2f1d86890a2dfb989f9a77cfcfd3e47c2a354b01111771326f8aa26e0254"
             ],
-            "version": "==1.13.0"
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
+            "version": "==1.16.0"
         },
         "snowballstemmer": {
             "hashes": [
-                "sha256:209f257d7533fdb3cb73bdbd24f436239ca3b2fa67d56f6ff88e86be08cc5ef0",
-                "sha256:df3bac3df4c2c01363f3dd2cfa78cce2840a79b9f1c2d2de9ce8d31683992f52"
+                "sha256:b51b447bea85f9968c13b650126a888aabd4cb4463fca868ec596826325dedc2",
+                "sha256:e997baa4f2e9139951b6f4c631bad912dfd3c792467e2f03d7239464af90e914"
             ],
-            "version": "==2.0.0"
+            "version": "==2.1.0"
         },
         "sphinx": {
             "hashes": [
@@ -196,66 +281,92 @@
         },
         "sphinxcontrib-applehelp": {
             "hashes": [
-                "sha256:edaa0ab2b2bc74403149cb0209d6775c96de797dfd5b5e2a71981309efab3897",
-                "sha256:fb8dee85af95e5c30c91f10e7eb3c8967308518e0f7488a2828ef7bc191d0d5d"
+                "sha256:806111e5e962be97c29ec4c1e7fe277bfd19e9652fb1a4392105b43e01af885a",
+                "sha256:a072735ec80e7675e3f432fcae8610ecf509c5f1869d17e2eecff44389cdbc58"
             ],
-            "version": "==1.0.1"
+            "markers": "python_version >= '3.5'",
+            "version": "==1.0.2"
         },
         "sphinxcontrib-devhelp": {
             "hashes": [
-                "sha256:6c64b077937330a9128a4da74586e8c2130262f014689b4b89e2d08ee7294a34",
-                "sha256:9512ecb00a2b0821a146736b39f7aeb90759834b07e81e8cc23a9c70bacb9981"
+                "sha256:8165223f9a335cc1af7ffe1ed31d2871f325254c0423bc0c4c7cd1c1e4734a2e",
+                "sha256:ff7f1afa7b9642e7060379360a67e9c41e8f3121f2ce9164266f61b9f4b338e4"
             ],
-            "version": "==1.0.1"
+            "markers": "python_version >= '3.5'",
+            "version": "==1.0.2"
         },
         "sphinxcontrib-htmlhelp": {
             "hashes": [
-                "sha256:4670f99f8951bd78cd4ad2ab962f798f5618b17675c35c5ac3b2132a14ea8422",
-                "sha256:d4fd39a65a625c9df86d7fa8a2d9f3cd8299a3a4b15db63b50aac9e161d8eff7"
+                "sha256:d412243dfb797ae3ec2b59eca0e52dac12e75a241bf0e4eb861e450d06c6ed07",
+                "sha256:f5f8bb2d0d629f398bf47d0d69c07bc13b65f75a81ad9e2f71a63d4b7a2f6db2"
             ],
-            "version": "==1.0.2"
+            "markers": "python_version >= '3.6'",
+            "version": "==2.0.0"
         },
         "sphinxcontrib-jsmath": {
             "hashes": [
                 "sha256:2ec2eaebfb78f3f2078e73666b1415417a116cc848b72e5172e596c871103178",
                 "sha256:a9925e4a4587247ed2191a22df5f6970656cb8ca2bd6284309578f2153e0c4b8"
             ],
+            "markers": "python_version >= '3.5'",
             "version": "==1.0.1"
         },
         "sphinxcontrib-qthelp": {
             "hashes": [
-                "sha256:513049b93031beb1f57d4daea74068a4feb77aa5630f856fcff2e50de14e9a20",
-                "sha256:79465ce11ae5694ff165becda529a600c754f4bc459778778c7017374d4d406f"
+                "sha256:4c33767ee058b70dba89a6fc5c1892c0d57a54be67ddd3e7875a18d14cba5a72",
+                "sha256:bd9fc24bcb748a8d51fd4ecaade681350aa63009a347a8c14e637895444dfab6"
             ],
-            "version": "==1.0.2"
+            "markers": "python_version >= '3.5'",
+            "version": "==1.0.3"
         },
         "sphinxcontrib-serializinghtml": {
             "hashes": [
-                "sha256:c0efb33f8052c04fd7a26c0a07f1678e8512e0faec19f4aa8f2473a8b81d5227",
-                "sha256:db6615af393650bf1151a6cd39120c29abaf93cc60db8c48eb2dddbfdc3a9768"
+                "sha256:352a9a00ae864471d3a7ead8d7d79f5fc0b57e8b3f95e9867eb9eb28999b92fd",
+                "sha256:aa5f6de5dfdf809ef505c4895e51ef5c9eac17d0f287933eb49ec495280b6952"
             ],
-            "version": "==1.1.3"
+            "markers": "python_version >= '3.5'",
+            "version": "==1.1.5"
+        },
+        "typing-extensions": {
+            "hashes": [
+                "sha256:49f75d16ff11f1cd258e1b988ccff82a3ca5570217d7ad8c5f48205dd99a677e",
+                "sha256:d8226d10bc02a29bcc81df19a26e56a9647f8b0a6d4a83924139f4a8b01f17b7",
+                "sha256:f1d25edafde516b146ecd0613dabcc61409817af4766fbbcfb8d1ad4ec441a34"
+            ],
+            "markers": "python_version < '3.8'",
+            "version": "==3.10.0.2"
         },
         "urllib3": {
             "hashes": [
-                "sha256:3de946ffbed6e6746608990594d08faac602528ac7015ac28d33cee6a45b7398",
-                "sha256:9a107b99a5393caf59c7aa3c1249c16e6879447533d0887f4336dde834c7be86"
+                "sha256:4987c65554f7a2dbf30c18fd48778ef124af6fab771a377103da0585e2336ece",
+                "sha256:c4fdf4019605b6e5423637e01bc9fe4daef873709a7973e195ceba0a62bbc844"
             ],
-            "version": "==1.25.6"
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4' and python_version < '4'",
+            "version": "==1.26.7"
         },
         "virtualenv": {
             "hashes": [
-                "sha256:11cb4608930d5fd3afb545ecf8db83fa50e1f96fc4fca80c94b07d2c83146589",
-                "sha256:d257bb3773e48cac60e475a19b608996c73f4d333b3ba2e4e57d5ac6134e0136"
+                "sha256:10062e34c204b5e4ec5f62e6ef2473f8ba76513a9a617e873f1f8fb4a519d300",
+                "sha256:bcc17f0b3a29670dd777d6f0755a4c04f28815395bca279cdcb213b97199a6b8"
             ],
-            "version": "==16.7.7"
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'",
+            "version": "==20.8.1"
         },
         "virtualenv-clone": {
             "hashes": [
-                "sha256:532f789a5c88adf339506e3ca03326f20ee82fd08ee5586b44dc859b5b4468c5",
-                "sha256:c88ae171a11b087ea2513f260cdac9232461d8e9369bcd1dc143fc399d220557"
+                "sha256:418ee935c36152f8f153c79824bb93eaf6f0f7984bae31d3f48f350b9183501a",
+                "sha256:44d5263bceed0bac3e1424d64f798095233b64def1c5689afa43dc3223caf5b0"
+            ],
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
+            "version": "==0.5.7"
+        },
+        "zipp": {
+            "hashes": [
+                "sha256:71c644c5369f4a6e07636f0aa966270449561fcea2e3d6747b8d23efaa9d7832",
+                "sha256:9fe5ea21568a0a70e50f273397638d39b03353731e6cbbb3fd8502a33fec40bc"
             ],
-            "version": "==0.5.3"
+            "markers": "python_version < '3.10'",
+            "version": "==3.6.0"
         }
     },
     "develop": {}
diff --git a/requirements.txt b/requirements.txt
index add5632..b468e36 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,42 +1,46 @@
-################################################################################
-# This requirements file has been automatically generated from `Pipfile` with
-# `pipenv-to-requirements`
 #
+# These requirements were autogenerated by pipenv
+# To regenerate from the project's Pipfile, run:
 #
-# This has been done to maintain backward compatibility with tools and services
-# that do not support `Pipfile` yet.
+#    pipenv lock --requirements
 #
-# Do NOT edit it directly, use `pipenv install [-d]` to modify `Pipfile` and
-# `Pipfile.lock` and then regenerate `requirements*.txt`.
-################################################################################
 
+-i https://pypi.org/simple/
 alabaster==0.7.12
-babel==2.7.0
-certifi==2019.9.11
-chardet==3.0.4
-docutils==0.15.2
-idna==2.8
-imagesize==1.1.0
-jinja2==2.10.3
-markupsafe==1.1.1
-packaging==19.2
-pbr==5.4.3
+babel==2.9.1
+backports.entry-points-selectable==1.1.0; python_version >= '2.7'
+certifi==2021.10.8
+charset-normalizer==2.0.7; python_version >= '3'
+distlib==0.3.3
+docutils==0.17.1; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'
+filelock==3.3.1; python_version >= '3.6'
+idna==3.3; python_version >= '3'
+imagesize==1.2.0; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
+importlib-metadata==4.8.1; python_version < '3.8'
+importlib-resources==5.3.0; python_version < '3.7'
+jinja2==3.0.2; python_version >= '3.6'
+markupsafe==2.0.1; python_version >= '3.6'
+packaging==21.0; python_version >= '3.6'
+pbr==5.6.0; python_version >= '2.6'
 pipenv-to-requirements==0.8.2
-pipenv==2018.11.26
-pygments==2.4.2
-pyparsing==2.4.4
-pytz==2019.3
-requests==2.22.0
-six==1.13.0
-snowballstemmer==2.0.0
+pipenv==2021.5.29; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
+platformdirs==2.4.0; python_version >= '3.6'
+pygments==2.10.0; python_version >= '3.5'
+pyparsing==2.4.7; python_version >= '2.6' and python_version not in '3.0, 3.1, 3.2, 3.3'
+pytz==2021.3
+requests==2.26.0; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4, 3.5'
+six==1.16.0; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
+snowballstemmer==2.1.0
 sphinx-rtd-theme==0.4.3
 sphinx==2.2.1
-sphinxcontrib-applehelp==1.0.1
-sphinxcontrib-devhelp==1.0.1
-sphinxcontrib-htmlhelp==1.0.2
-sphinxcontrib-jsmath==1.0.1
-sphinxcontrib-qthelp==1.0.2
-sphinxcontrib-serializinghtml==1.1.3
-urllib3==1.25.6
-virtualenv-clone==0.5.3
-virtualenv==16.7.7
+sphinxcontrib-applehelp==1.0.2; python_version >= '3.5'
+sphinxcontrib-devhelp==1.0.2; python_version >= '3.5'
+sphinxcontrib-htmlhelp==2.0.0; python_version >= '3.6'
+sphinxcontrib-jsmath==1.0.1; python_version >= '3.5'
+sphinxcontrib-qthelp==1.0.3; python_version >= '3.5'
+sphinxcontrib-serializinghtml==1.1.5; python_version >= '3.5'
+typing-extensions==3.10.0.2; python_version < '3.8'
+urllib3==1.26.7; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4' and python_version < '4'
+virtualenv-clone==0.5.7; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
+virtualenv==20.8.1; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'
+zipp==3.6.0; python_version < '3.10'