diff --git a/Gemfile b/Gemfile
index ee8ebd4..ca81004 100644
--- a/Gemfile
+++ b/Gemfile
@@ -11,7 +11,7 @@ gem 'rails', '~> 5.1.4'
 # Use postgresql as the database for Active Record
 gem 'pg', '~> 0.18'
 # Use Puma as the app server
-gem 'puma', '~> 3.7'
+gem 'puma', '~> 3.12', '>= 3.12.2'
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 5.0'
 # Use Uglifier as compressor for JavaScript assets
diff --git a/Gemfile.lock b/Gemfile.lock
index c1f017f..423b3c5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,246 +1,246 @@
-GEM
-  remote: https://rubygems.org/
-  specs:
-    actioncable (5.1.4)
-      actionpack (= 5.1.4)
-      nio4r (~> 2.0)
-      websocket-driver (~> 0.6.1)
-    actionmailer (5.1.4)
-      actionpack (= 5.1.4)
-      actionview (= 5.1.4)
-      activejob (= 5.1.4)
-      mail (~> 2.5, >= 2.5.4)
-      rails-dom-testing (~> 2.0)
-    actionpack (5.1.4)
-      actionview (= 5.1.4)
-      activesupport (= 5.1.4)
-      rack (~> 2.0)
-      rack-test (>= 0.6.3)
-      rails-dom-testing (~> 2.0)
-      rails-html-sanitizer (~> 1.0, >= 1.0.2)
-    actionview (5.1.4)
-      activesupport (= 5.1.4)
-      builder (~> 3.1)
-      erubi (~> 1.4)
-      rails-dom-testing (~> 2.0)
-      rails-html-sanitizer (~> 1.0, >= 1.0.3)
-    activejob (5.1.4)
-      activesupport (= 5.1.4)
-      globalid (>= 0.3.6)
-    activemodel (5.1.4)
-      activesupport (= 5.1.4)
-    activerecord (5.1.4)
-      activemodel (= 5.1.4)
-      activesupport (= 5.1.4)
-      arel (~> 8.0)
-    activesupport (5.1.4)
-      concurrent-ruby (~> 1.0, >= 1.0.2)
-      i18n (~> 0.7)
-      minitest (~> 5.1)
-      tzinfo (~> 1.1)
-    addressable (2.5.2)
-      public_suffix (>= 2.0.2, < 4.0)
-    arel (8.0.0)
-    bindex (0.5.0)
-    builder (3.2.3)
-    byebug (10.0.0)
-    capybara (2.17.0)
-      addressable
-      mini_mime (>= 0.1.3)
-      nokogiri (>= 1.3.3)
-      rack (>= 1.0.0)
-      rack-test (>= 0.5.4)
-      xpath (>= 2.0, < 4.0)
-    childprocess (0.8.0)
-      ffi (~> 1.0, >= 1.0.11)
-    coffee-rails (4.2.2)
-      coffee-script (>= 2.2.0)
-      railties (>= 4.0.0)
-    coffee-script (2.4.1)
-      coffee-script-source
-      execjs
-    coffee-script-source (1.12.2)
-    concurrent-ruby (1.0.5)
-    crack (0.4.3)
-      safe_yaml (~> 1.0.0)
-    crass (1.0.4)
-    diff-lcs (1.3)
-    domain_name (0.5.20170404)
-      unf (>= 0.0.5, < 1.0.0)
-    erubi (1.7.0)
-    execjs (2.7.0)
-    faker (1.8.7)
-      i18n (>= 0.7)
-    ffi (1.11.1)
-    globalid (0.4.1)
-      activesupport (>= 4.2.0)
-    hashdiff (0.3.7)
-    http-cookie (1.0.3)
-      domain_name (~> 0.5)
-    i18n (0.9.4)
-      concurrent-ruby (~> 1.0)
-    jbuilder (2.7.0)
-      activesupport (>= 4.2.0)
-      multi_json (>= 1.2)
-    listen (3.1.5)
-      rb-fsevent (~> 0.9, >= 0.9.4)
-      rb-inotify (~> 0.9, >= 0.9.7)
-      ruby_dep (~> 1.2)
-    loofah (2.3.0)
-      crass (~> 1.0.2)
-      nokogiri (>= 1.5.9)
-    mail (2.7.0)
-      mini_mime (>= 0.1.1)
-    method_source (0.9.0)
-    mime-types (3.1)
-      mime-types-data (~> 3.2015)
-    mime-types-data (3.2016.0521)
-    mini_mime (1.0.0)
-    mini_portile2 (2.4.0)
-    minitest (5.11.3)
-    multi_json (1.13.1)
-    netrc (0.11.0)
-    nio4r (2.2.0)
-    nokogiri (1.10.4)
-      mini_portile2 (~> 2.4.0)
-    pg (0.21.0)
-    public_suffix (3.0.1)
-    puma (3.11.2)
-    rack (2.0.7)
-    rack-test (0.8.2)
-      rack (>= 1.0, < 3)
-    rails (5.1.4)
-      actioncable (= 5.1.4)
-      actionmailer (= 5.1.4)
-      actionpack (= 5.1.4)
-      actionview (= 5.1.4)
-      activejob (= 5.1.4)
-      activemodel (= 5.1.4)
-      activerecord (= 5.1.4)
-      activesupport (= 5.1.4)
-      bundler (>= 1.3.0)
-      railties (= 5.1.4)
-      sprockets-rails (>= 2.0.0)
-    rails-dom-testing (2.0.3)
-      activesupport (>= 4.2.0)
-      nokogiri (>= 1.6)
-    rails-html-sanitizer (1.3.0)
-      loofah (~> 2.3)
-    railties (5.1.4)
-      actionpack (= 5.1.4)
-      activesupport (= 5.1.4)
-      method_source
-      rake (>= 0.8.7)
-      thor (>= 0.18.1, < 2.0)
-    rake (12.3.0)
-    rb-fsevent (0.10.2)
-    rb-inotify (0.9.10)
-      ffi (>= 0.5.0, < 2)
-    rest-client (2.0.2)
-      http-cookie (>= 1.0.2, < 2.0)
-      mime-types (>= 1.16, < 4.0)
-      netrc (~> 0.8)
-    rspec-core (3.7.1)
-      rspec-support (~> 3.7.0)
-    rspec-expectations (3.7.0)
-      diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.7.0)
-    rspec-mocks (3.7.0)
-      diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.7.0)
-    rspec-rails (3.7.2)
-      actionpack (>= 3.0)
-      activesupport (>= 3.0)
-      railties (>= 3.0)
-      rspec-core (~> 3.7.0)
-      rspec-expectations (~> 3.7.0)
-      rspec-mocks (~> 3.7.0)
-      rspec-support (~> 3.7.0)
-    rspec-support (3.7.1)
-    ruby_dep (1.5.0)
-    rubyzip (1.3.0)
-    safe_yaml (1.0.4)
-    sass (3.5.5)
-      sass-listen (~> 4.0.0)
-    sass-listen (4.0.0)
-      rb-fsevent (~> 0.9, >= 0.9.4)
-      rb-inotify (~> 0.9, >= 0.9.7)
-    sass-rails (5.0.7)
-      railties (>= 4.0.0, < 6)
-      sass (~> 3.1)
-      sprockets (>= 2.8, < 4.0)
-      sprockets-rails (>= 2.0, < 4.0)
-      tilt (>= 1.1, < 3)
-    selenium-webdriver (3.9.0)
-      childprocess (~> 0.5)
-      rubyzip (~> 1.2)
-    spring (2.0.2)
-      activesupport (>= 4.2)
-    spring-watcher-listen (2.0.1)
-      listen (>= 2.7, < 4.0)
-      spring (>= 1.2, < 3.0)
-    sprockets (3.7.2)
-      concurrent-ruby (~> 1.0)
-      rack (> 1, < 3)
-    sprockets-rails (3.2.1)
-      actionpack (>= 4.0)
-      activesupport (>= 4.0)
-      sprockets (>= 3.0.0)
-    sucker_punch (2.0.4)
-      concurrent-ruby (~> 1.0.0)
-    thor (0.20.0)
-    thread_safe (0.3.6)
-    tilt (2.0.8)
-    turbolinks (5.1.0)
-      turbolinks-source (~> 5.1)
-    turbolinks-source (5.1.0)
-    tzinfo (1.2.5)
-      thread_safe (~> 0.1)
-    uglifier (4.1.6)
-      execjs (>= 0.3.0, < 3)
-    unf (0.1.4)
-      unf_ext
-    unf_ext (0.0.7.5)
-    web-console (3.5.1)
-      actionview (>= 5.0)
-      activemodel (>= 5.0)
-      bindex (>= 0.4.0)
-      railties (>= 5.0)
-    webmock (3.3.0)
-      addressable (>= 2.3.6)
-      crack (>= 0.3.2)
-      hashdiff
-    websocket-driver (0.6.5)
-      websocket-extensions (>= 0.1.0)
-    websocket-extensions (0.1.3)
-    xpath (3.0.0)
-      nokogiri (~> 1.8)
-
-PLATFORMS
-  ruby
-
-DEPENDENCIES
-  byebug
-  capybara (~> 2.13)
-  coffee-rails (~> 4.2)
-  faker (~> 1.8, >= 1.8.7)
-  jbuilder (~> 2.5)
-  listen (>= 3.0.5, < 3.2)
-  pg (~> 0.18)
-  puma (~> 3.7)
-  rails (~> 5.1.4)
-  rest-client (~> 2.0, >= 2.0.2)
-  rspec-rails (~> 3.7)
-  sass-rails (~> 5.0)
-  selenium-webdriver
-  spring
-  spring-watcher-listen (~> 2.0.0)
-  sucker_punch (~> 2.0)
-  turbolinks (~> 5)
-  tzinfo-data
-  uglifier (>= 1.3.0)
-  web-console (>= 3.3.0)
+GEM
+  remote: https://rubygems.org/
+  specs:
+    actioncable (5.1.4)
+      actionpack (= 5.1.4)
+      nio4r (~> 2.0)
+      websocket-driver (~> 0.6.1)
+    actionmailer (5.1.4)
+      actionpack (= 5.1.4)
+      actionview (= 5.1.4)
+      activejob (= 5.1.4)
+      mail (~> 2.5, >= 2.5.4)
+      rails-dom-testing (~> 2.0)
+    actionpack (5.1.4)
+      actionview (= 5.1.4)
+      activesupport (= 5.1.4)
+      rack (~> 2.0)
+      rack-test (>= 0.6.3)
+      rails-dom-testing (~> 2.0)
+      rails-html-sanitizer (~> 1.0, >= 1.0.2)
+    actionview (5.1.4)
+      activesupport (= 5.1.4)
+      builder (~> 3.1)
+      erubi (~> 1.4)
+      rails-dom-testing (~> 2.0)
+      rails-html-sanitizer (~> 1.0, >= 1.0.3)
+    activejob (5.1.4)
+      activesupport (= 5.1.4)
+      globalid (>= 0.3.6)
+    activemodel (5.1.4)
+      activesupport (= 5.1.4)
+    activerecord (5.1.4)
+      activemodel (= 5.1.4)
+      activesupport (= 5.1.4)
+      arel (~> 8.0)
+    activesupport (5.1.4)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (~> 0.7)
+      minitest (~> 5.1)
+      tzinfo (~> 1.1)
+    addressable (2.5.2)
+      public_suffix (>= 2.0.2, < 4.0)
+    arel (8.0.0)
+    bindex (0.5.0)
+    builder (3.2.3)
+    byebug (10.0.0)
+    capybara (2.17.0)
+      addressable
+      mini_mime (>= 0.1.3)
+      nokogiri (>= 1.3.3)
+      rack (>= 1.0.0)
+      rack-test (>= 0.5.4)
+      xpath (>= 2.0, < 4.0)
+    childprocess (0.8.0)
+      ffi (~> 1.0, >= 1.0.11)
+    coffee-rails (4.2.2)
+      coffee-script (>= 2.2.0)
+      railties (>= 4.0.0)
+    coffee-script (2.4.1)
+      coffee-script-source
+      execjs
+    coffee-script-source (1.12.2)
+    concurrent-ruby (1.0.5)
+    crack (0.4.3)
+      safe_yaml (~> 1.0.0)
+    crass (1.0.4)
+    diff-lcs (1.3)
+    domain_name (0.5.20170404)
+      unf (>= 0.0.5, < 1.0.0)
+    erubi (1.7.0)
+    execjs (2.7.0)
+    faker (1.8.7)
+      i18n (>= 0.7)
+    ffi (1.11.1)
+    globalid (0.4.1)
+      activesupport (>= 4.2.0)
+    hashdiff (0.3.7)
+    http-cookie (1.0.3)
+      domain_name (~> 0.5)
+    i18n (0.9.4)
+      concurrent-ruby (~> 1.0)
+    jbuilder (2.7.0)
+      activesupport (>= 4.2.0)
+      multi_json (>= 1.2)
+    listen (3.1.5)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
+      ruby_dep (~> 1.2)
+    loofah (2.3.0)
+      crass (~> 1.0.2)
+      nokogiri (>= 1.5.9)
+    mail (2.7.0)
+      mini_mime (>= 0.1.1)
+    method_source (0.9.0)
+    mime-types (3.1)
+      mime-types-data (~> 3.2015)
+    mime-types-data (3.2016.0521)
+    mini_mime (1.0.0)
+    mini_portile2 (2.4.0)
+    minitest (5.11.3)
+    multi_json (1.13.1)
+    netrc (0.11.0)
+    nio4r (2.2.0)
+    nokogiri (1.10.4)
+      mini_portile2 (~> 2.4.0)
+    pg (0.21.0)
+    public_suffix (3.0.1)
+    puma (3.12.2)
+    rack (2.0.7)
+    rack-test (0.8.2)
+      rack (>= 1.0, < 3)
+    rails (5.1.4)
+      actioncable (= 5.1.4)
+      actionmailer (= 5.1.4)
+      actionpack (= 5.1.4)
+      actionview (= 5.1.4)
+      activejob (= 5.1.4)
+      activemodel (= 5.1.4)
+      activerecord (= 5.1.4)
+      activesupport (= 5.1.4)
+      bundler (>= 1.3.0)
+      railties (= 5.1.4)
+      sprockets-rails (>= 2.0.0)
+    rails-dom-testing (2.0.3)
+      activesupport (>= 4.2.0)
+      nokogiri (>= 1.6)
+    rails-html-sanitizer (1.3.0)
+      loofah (~> 2.3)
+    railties (5.1.4)
+      actionpack (= 5.1.4)
+      activesupport (= 5.1.4)
+      method_source
+      rake (>= 0.8.7)
+      thor (>= 0.18.1, < 2.0)
+    rake (12.3.0)
+    rb-fsevent (0.10.2)
+    rb-inotify (0.9.10)
+      ffi (>= 0.5.0, < 2)
+    rest-client (2.0.2)
+      http-cookie (>= 1.0.2, < 2.0)
+      mime-types (>= 1.16, < 4.0)
+      netrc (~> 0.8)
+    rspec-core (3.7.1)
+      rspec-support (~> 3.7.0)
+    rspec-expectations (3.7.0)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.7.0)
+    rspec-mocks (3.7.0)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.7.0)
+    rspec-rails (3.7.2)
+      actionpack (>= 3.0)
+      activesupport (>= 3.0)
+      railties (>= 3.0)
+      rspec-core (~> 3.7.0)
+      rspec-expectations (~> 3.7.0)
+      rspec-mocks (~> 3.7.0)
+      rspec-support (~> 3.7.0)
+    rspec-support (3.7.1)
+    ruby_dep (1.5.0)
+    rubyzip (1.3.0)
+    safe_yaml (1.0.4)
+    sass (3.5.5)
+      sass-listen (~> 4.0.0)
+    sass-listen (4.0.0)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
+    sass-rails (5.0.7)
+      railties (>= 4.0.0, < 6)
+      sass (~> 3.1)
+      sprockets (>= 2.8, < 4.0)
+      sprockets-rails (>= 2.0, < 4.0)
+      tilt (>= 1.1, < 3)
+    selenium-webdriver (3.9.0)
+      childprocess (~> 0.5)
+      rubyzip (~> 1.2)
+    spring (2.0.2)
+      activesupport (>= 4.2)
+    spring-watcher-listen (2.0.1)
+      listen (>= 2.7, < 4.0)
+      spring (>= 1.2, < 3.0)
+    sprockets (3.7.2)
+      concurrent-ruby (~> 1.0)
+      rack (> 1, < 3)
+    sprockets-rails (3.2.1)
+      actionpack (>= 4.0)
+      activesupport (>= 4.0)
+      sprockets (>= 3.0.0)
+    sucker_punch (2.0.4)
+      concurrent-ruby (~> 1.0.0)
+    thor (0.20.0)
+    thread_safe (0.3.6)
+    tilt (2.0.8)
+    turbolinks (5.1.0)
+      turbolinks-source (~> 5.1)
+    turbolinks-source (5.1.0)
+    tzinfo (1.2.5)
+      thread_safe (~> 0.1)
+    uglifier (4.1.6)
+      execjs (>= 0.3.0, < 3)
+    unf (0.1.4)
+      unf_ext
+    unf_ext (0.0.7.5)
+    web-console (3.5.1)
+      actionview (>= 5.0)
+      activemodel (>= 5.0)
+      bindex (>= 0.4.0)
+      railties (>= 5.0)
+    webmock (3.3.0)
+      addressable (>= 2.3.6)
+      crack (>= 0.3.2)
+      hashdiff
+    websocket-driver (0.6.5)
+      websocket-extensions (>= 0.1.0)
+    websocket-extensions (0.1.3)
+    xpath (3.0.0)
+      nokogiri (~> 1.8)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  byebug
+  capybara (~> 2.13)
+  coffee-rails (~> 4.2)
+  faker (~> 1.8, >= 1.8.7)
+  jbuilder (~> 2.5)
+  listen (>= 3.0.5, < 3.2)
+  pg (~> 0.18)
+  puma (~> 3.12, >= 3.12.2)
+  rails (~> 5.1.4)
+  rest-client (~> 2.0, >= 2.0.2)
+  rspec-rails (~> 3.7)
+  sass-rails (~> 5.0)
+  selenium-webdriver
+  spring
+  spring-watcher-listen (~> 2.0.0)
+  sucker_punch (~> 2.0)
+  turbolinks (~> 5)
+  tzinfo-data
+  uglifier (>= 1.3.0)
+  web-console (>= 3.3.0)
   webmock (~> 3.3)
 
 BUNDLED WITH
-   1.16.1
+   1.17.3