diff --git a/package.json b/package.json
index e427f30..8d699c0 100644
--- a/package.json
+++ b/package.json
@@ -33,7 +33,7 @@
     "raven": "^2.6.4"
   },
   "devDependencies": {
-    "babel-eslint": "^8.0.2",
+    "babel-eslint": "^9.0.0",
     "eslint": "4.9.0",
     "eslint-config-airbnb": "^16.1.0",
     "eslint-config-prettier": "^6.7.0",
diff --git a/yarn.lock b/yarn.lock
index 4a73384..593343c 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2,12 +2,6 @@
 # yarn lockfile v1
 
 
-"@babel/code-frame@7.0.0-beta.44":
-  version "7.0.0-beta.44"
-  resolved "https://registry.yarnpkg.com/@babel/code-frame/-/code-frame-7.0.0-beta.44.tgz#2a02643368de80916162be70865c97774f3adbd9"
-  dependencies:
-    "@babel/highlight" "7.0.0-beta.44"
-
 "@babel/code-frame@^7.0.0", "@babel/code-frame@^7.5.5":
   version "7.5.5"
   resolved "https://registry.yarnpkg.com/@babel/code-frame/-/code-frame-7.5.5.tgz#bc0782f6d69f7b7d49531219699b988f669a8f9d"
@@ -33,17 +27,7 @@
     semver "^5.4.1"
     source-map "^0.5.0"
 
-"@babel/generator@7.0.0-beta.44":
-  version "7.0.0-beta.44"
-  resolved "https://registry.yarnpkg.com/@babel/generator/-/generator-7.0.0-beta.44.tgz#c7e67b9b5284afcf69b309b50d7d37f3e5033d42"
-  dependencies:
-    "@babel/types" "7.0.0-beta.44"
-    jsesc "^2.5.1"
-    lodash "^4.2.0"
-    source-map "^0.5.0"
-    trim-right "^1.0.1"
-
-"@babel/generator@^7.4.0", "@babel/generator@^7.6.3", "@babel/generator@^7.6.4":
+"@babel/generator@^7.4.0", "@babel/generator@^7.6.4":
   version "7.6.4"
   resolved "https://registry.yarnpkg.com/@babel/generator/-/generator-7.6.4.tgz#a4f8437287bf9671b07f483b76e3bb731bc97671"
   dependencies:
@@ -52,49 +36,38 @@
     lodash "^4.17.13"
     source-map "^0.5.0"
 
-"@babel/helper-function-name@7.0.0-beta.44":
-  version "7.0.0-beta.44"
-  resolved "https://registry.yarnpkg.com/@babel/helper-function-name/-/helper-function-name-7.0.0-beta.44.tgz#e18552aaae2231100a6e485e03854bc3532d44dd"
-  dependencies:
-    "@babel/helper-get-function-arity" "7.0.0-beta.44"
-    "@babel/template" "7.0.0-beta.44"
-    "@babel/types" "7.0.0-beta.44"
-
-"@babel/helper-function-name@^7.1.0":
-  version "7.1.0"
-  resolved "https://registry.yarnpkg.com/@babel/helper-function-name/-/helper-function-name-7.1.0.tgz#a0ceb01685f73355d4360c1247f582bfafc8ff53"
+"@babel/generator@^7.7.4":
+  version "7.7.4"
+  resolved "https://registry.yarnpkg.com/@babel/generator/-/generator-7.7.4.tgz#db651e2840ca9aa66f327dcec1dc5f5fa9611369"
   dependencies:
-    "@babel/helper-get-function-arity" "^7.0.0"
-    "@babel/template" "^7.1.0"
-    "@babel/types" "^7.0.0"
+    "@babel/types" "^7.7.4"
+    jsesc "^2.5.1"
+    lodash "^4.17.13"
+    source-map "^0.5.0"
 
-"@babel/helper-get-function-arity@7.0.0-beta.44":
-  version "7.0.0-beta.44"
-  resolved "https://registry.yarnpkg.com/@babel/helper-get-function-arity/-/helper-get-function-arity-7.0.0-beta.44.tgz#d03ca6dd2b9f7b0b1e6b32c56c72836140db3a15"
+"@babel/helper-function-name@^7.7.4":
+  version "7.7.4"
+  resolved "https://registry.yarnpkg.com/@babel/helper-function-name/-/helper-function-name-7.7.4.tgz#ab6e041e7135d436d8f0a3eca15de5b67a341a2e"
   dependencies:
-    "@babel/types" "7.0.0-beta.44"
+    "@babel/helper-get-function-arity" "^7.7.4"
+    "@babel/template" "^7.7.4"
+    "@babel/types" "^7.7.4"
 
-"@babel/helper-get-function-arity@^7.0.0":
-  version "7.0.0"
-  resolved "https://registry.yarnpkg.com/@babel/helper-get-function-arity/-/helper-get-function-arity-7.0.0.tgz#83572d4320e2a4657263734113c42868b64e49c3"
+"@babel/helper-get-function-arity@^7.7.4":
+  version "7.7.4"
+  resolved "https://registry.yarnpkg.com/@babel/helper-get-function-arity/-/helper-get-function-arity-7.7.4.tgz#cb46348d2f8808e632f0ab048172130e636005f0"
   dependencies:
-    "@babel/types" "^7.0.0"
+    "@babel/types" "^7.7.4"
 
 "@babel/helper-plugin-utils@^7.0.0":
   version "7.0.0"
   resolved "https://registry.yarnpkg.com/@babel/helper-plugin-utils/-/helper-plugin-utils-7.0.0.tgz#bbb3fbee98661c569034237cc03967ba99b4f250"
 
-"@babel/helper-split-export-declaration@7.0.0-beta.44":
-  version "7.0.0-beta.44"
-  resolved "https://registry.yarnpkg.com/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.0.0-beta.44.tgz#c0b351735e0fbcb3822c8ad8db4e583b05ebd9dc"
+"@babel/helper-split-export-declaration@^7.7.4":
+  version "7.7.4"
+  resolved "https://registry.yarnpkg.com/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.7.4.tgz#57292af60443c4a3622cf74040ddc28e68336fd8"
   dependencies:
-    "@babel/types" "7.0.0-beta.44"
-
-"@babel/helper-split-export-declaration@^7.4.4":
-  version "7.4.4"
-  resolved "https://registry.yarnpkg.com/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.4.4.tgz#ff94894a340be78f53f06af038b205c49d993677"
-  dependencies:
-    "@babel/types" "^7.4.4"
+    "@babel/types" "^7.7.4"
 
 "@babel/helpers@^7.6.2":
   version "7.6.2"
@@ -104,14 +77,6 @@
     "@babel/traverse" "^7.6.2"
     "@babel/types" "^7.6.0"
 
-"@babel/highlight@7.0.0-beta.44":
-  version "7.0.0-beta.44"
-  resolved "https://registry.yarnpkg.com/@babel/highlight/-/highlight-7.0.0-beta.44.tgz#18c94ce543916a80553edcdcf681890b200747d5"
-  dependencies:
-    chalk "^2.0.0"
-    esutils "^2.0.2"
-    js-tokens "^3.0.0"
-
 "@babel/highlight@^7.0.0":
   version "7.0.0"
   resolved "https://registry.yarnpkg.com/@babel/highlight/-/highlight-7.0.0.tgz#f710c38c8d458e6dd9a201afb637fcb781ce99e4"
@@ -120,9 +85,9 @@
     esutils "^2.0.2"
     js-tokens "^4.0.0"
 
-"@babel/parser@^7.1.0", "@babel/parser@^7.4.3", "@babel/parser@^7.6.0", "@babel/parser@^7.6.3", "@babel/parser@^7.6.4":
-  version "7.6.4"
-  resolved "https://registry.yarnpkg.com/@babel/parser/-/parser-7.6.4.tgz#cb9b36a7482110282d5cb6dd424ec9262b473d81"
+"@babel/parser@^7.0.0", "@babel/parser@^7.1.0", "@babel/parser@^7.4.3", "@babel/parser@^7.6.0", "@babel/parser@^7.6.4", "@babel/parser@^7.7.4":
+  version "7.7.4"
+  resolved "https://registry.yarnpkg.com/@babel/parser/-/parser-7.7.4.tgz#75ab2d7110c2cf2fa949959afb05fa346d2231bb"
 
 "@babel/plugin-syntax-object-rest-spread@^7.0.0":
   version "7.2.0"
@@ -130,16 +95,7 @@
   dependencies:
     "@babel/helper-plugin-utils" "^7.0.0"
 
-"@babel/template@7.0.0-beta.44":
-  version "7.0.0-beta.44"
-  resolved "https://registry.yarnpkg.com/@babel/template/-/template-7.0.0-beta.44.tgz#f8832f4fdcee5d59bf515e595fc5106c529b394f"
-  dependencies:
-    "@babel/code-frame" "7.0.0-beta.44"
-    "@babel/types" "7.0.0-beta.44"
-    babylon "7.0.0-beta.44"
-    lodash "^4.2.0"
-
-"@babel/template@^7.1.0", "@babel/template@^7.4.0", "@babel/template@^7.6.0":
+"@babel/template@^7.4.0", "@babel/template@^7.6.0":
   version "7.6.0"
   resolved "https://registry.yarnpkg.com/@babel/template/-/template-7.6.0.tgz#7f0159c7f5012230dad64cca42ec9bdb5c9536e6"
   dependencies:
@@ -147,46 +103,31 @@
     "@babel/parser" "^7.6.0"
     "@babel/types" "^7.6.0"
 
-"@babel/traverse@7.0.0-beta.44":
-  version "7.0.0-beta.44"
-  resolved "https://registry.yarnpkg.com/@babel/traverse/-/traverse-7.0.0-beta.44.tgz#a970a2c45477ad18017e2e465a0606feee0d2966"
+"@babel/template@^7.7.4":
+  version "7.7.4"
+  resolved "https://registry.yarnpkg.com/@babel/template/-/template-7.7.4.tgz#428a7d9eecffe27deac0a98e23bf8e3675d2a77b"
   dependencies:
-    "@babel/code-frame" "7.0.0-beta.44"
-    "@babel/generator" "7.0.0-beta.44"
-    "@babel/helper-function-name" "7.0.0-beta.44"
-    "@babel/helper-split-export-declaration" "7.0.0-beta.44"
-    "@babel/types" "7.0.0-beta.44"
-    babylon "7.0.0-beta.44"
-    debug "^3.1.0"
-    globals "^11.1.0"
-    invariant "^2.2.0"
-    lodash "^4.2.0"
+    "@babel/code-frame" "^7.0.0"
+    "@babel/parser" "^7.7.4"
+    "@babel/types" "^7.7.4"
 
-"@babel/traverse@^7.1.0", "@babel/traverse@^7.4.3", "@babel/traverse@^7.6.2", "@babel/traverse@^7.6.3":
-  version "7.6.3"
-  resolved "https://registry.yarnpkg.com/@babel/traverse/-/traverse-7.6.3.tgz#66d7dba146b086703c0fb10dd588b7364cec47f9"
+"@babel/traverse@^7.0.0", "@babel/traverse@^7.1.0", "@babel/traverse@^7.4.3", "@babel/traverse@^7.6.2", "@babel/traverse@^7.6.3":
+  version "7.7.4"
+  resolved "https://registry.yarnpkg.com/@babel/traverse/-/traverse-7.7.4.tgz#9c1e7c60fb679fe4fcfaa42500833333c2058558"
   dependencies:
     "@babel/code-frame" "^7.5.5"
-    "@babel/generator" "^7.6.3"
-    "@babel/helper-function-name" "^7.1.0"
-    "@babel/helper-split-export-declaration" "^7.4.4"
-    "@babel/parser" "^7.6.3"
-    "@babel/types" "^7.6.3"
+    "@babel/generator" "^7.7.4"
+    "@babel/helper-function-name" "^7.7.4"
+    "@babel/helper-split-export-declaration" "^7.7.4"
+    "@babel/parser" "^7.7.4"
+    "@babel/types" "^7.7.4"
     debug "^4.1.0"
     globals "^11.1.0"
     lodash "^4.17.13"
 
-"@babel/types@7.0.0-beta.44":
-  version "7.0.0-beta.44"
-  resolved "https://registry.yarnpkg.com/@babel/types/-/types-7.0.0-beta.44.tgz#6b1b164591f77dec0a0342aca995f2d046b3a757"
-  dependencies:
-    esutils "^2.0.2"
-    lodash "^4.2.0"
-    to-fast-properties "^2.0.0"
-
-"@babel/types@^7.0.0", "@babel/types@^7.3.0", "@babel/types@^7.4.0", "@babel/types@^7.4.4", "@babel/types@^7.6.0", "@babel/types@^7.6.3":
-  version "7.6.3"
-  resolved "https://registry.yarnpkg.com/@babel/types/-/types-7.6.3.tgz#3f07d96f854f98e2fbd45c64b0cb942d11e8ba09"
+"@babel/types@^7.0.0", "@babel/types@^7.3.0", "@babel/types@^7.4.0", "@babel/types@^7.6.0", "@babel/types@^7.6.3", "@babel/types@^7.7.4":
+  version "7.7.4"
+  resolved "https://registry.yarnpkg.com/@babel/types/-/types-7.7.4.tgz#516570d539e44ddf308c07569c258ff94fde9193"
   dependencies:
     esutils "^2.0.2"
     lodash "^4.17.13"
@@ -627,14 +568,14 @@ babel-code-frame@^6.22.0:
     esutils "^2.0.2"
     js-tokens "^3.0.2"
 
-babel-eslint@^8.0.2:
-  version "8.2.6"
-  resolved "https://registry.yarnpkg.com/babel-eslint/-/babel-eslint-8.2.6.tgz#6270d0c73205628067c0f7ae1693a9e797acefd9"
+babel-eslint@^9.0.0:
+  version "9.0.0"
+  resolved "https://registry.yarnpkg.com/babel-eslint/-/babel-eslint-9.0.0.tgz#7d9445f81ed9f60aff38115f838970df9f2b6220"
   dependencies:
-    "@babel/code-frame" "7.0.0-beta.44"
-    "@babel/traverse" "7.0.0-beta.44"
-    "@babel/types" "7.0.0-beta.44"
-    babylon "7.0.0-beta.44"
+    "@babel/code-frame" "^7.0.0"
+    "@babel/parser" "^7.0.0"
+    "@babel/traverse" "^7.0.0"
+    "@babel/types" "^7.0.0"
     eslint-scope "3.7.1"
     eslint-visitor-keys "^1.0.0"
 
@@ -679,10 +620,6 @@ babel-runtime@^6.11.6:
     core-js "^2.4.0"
     regenerator-runtime "^0.11.0"
 
-babylon@7.0.0-beta.44:
-  version "7.0.0-beta.44"
-  resolved "https://registry.yarnpkg.com/babylon/-/babylon-7.0.0-beta.44.tgz#89159e15e6e30c5096e22d738d8c0af8a0e8ca1d"
-
 balanced-match@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/balanced-match/-/balanced-match-1.0.0.tgz#89b4d199ab2bee49de164ea02b89ce462d71b767"
@@ -2110,7 +2047,7 @@ interpret@^1.2.0:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/interpret/-/interpret-1.2.0.tgz#d5061a6224be58e8083985f5014d844359576296"
 
-invariant@^2.2.0, invariant@^2.2.2, invariant@^2.2.4:
+invariant@^2.2.2, invariant@^2.2.4:
   version "2.2.4"
   resolved "https://registry.yarnpkg.com/invariant/-/invariant-2.2.4.tgz#610f3c92c9359ce1db616e538008d23ff35158e6"
   dependencies:
@@ -3105,7 +3042,7 @@ lodash.sortby@^4.7.0:
   version "4.7.0"
   resolved "https://registry.yarnpkg.com/lodash.sortby/-/lodash.sortby-4.7.0.tgz#edd14c824e2cc9c1e0b0a1b42bb5210516a42438"
 
-lodash@^4.17.11, lodash@^4.17.13, lodash@^4.17.15, lodash@^4.17.4, lodash@^4.2.0, lodash@^4.3.0:
+lodash@^4.17.11, lodash@^4.17.13, lodash@^4.17.15, lodash@^4.17.4, lodash@^4.3.0:
   version "4.17.15"
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.15.tgz#b447f6670a0455bbfeedd11392eff330ea097548"
 
@@ -4728,10 +4665,6 @@ tr46@^1.0.1:
   dependencies:
     punycode "^2.1.0"
 
-trim-right@^1.0.1:
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/trim-right/-/trim-right-1.0.1.tgz#cb2e1203067e0c8de1f614094b9fe45704ea6003"
-
 tsscmp@1.0.6:
   version "1.0.6"
   resolved "https://registry.yarnpkg.com/tsscmp/-/tsscmp-1.0.6.tgz#85b99583ac3589ec4bfef825b5000aa911d605eb"