Applied rubocop.

Gemfile

@@ -78,10 +78,10 @@ group :development, :test do
   gem 'selenium-webdriver'
 
   # livereload on template changes (html, js, css)
-  gem 'guard', '>= 2.2.2', :require => false
-  gem 'guard-livereload',  :require => false
+  gem 'guard', '>= 2.2.2', require: false
+  gem 'guard-livereload',  require: false
   gem 'rack-livereload'
-  gem 'rb-fsevent',        :require => false
+  gem 'rb-fsevent',        require: false
 
   # code QA
   gem 'rubocop'

config/environments/development.rb

@@ -32,10 +32,12 @@ Rails.application.configure do
   config.assets.debug = false
 
   # Automatically inject JavaScript needed for LiveReload
-  config.middleware.insert_after(ActionDispatch::Static, Rack::LiveReload,
-    :min_delay        => 500,    # default 1000
-    :max_delay        => 10_000, # default 60_000
-    :live_reload_port => 35738
+  config.middleware.insert_after(
+    ActionDispatch::Static,
+    Rack::LiveReload,
+    min_delay: 500,    # default 1000
+    max_delay: 10_000, # default 60_000
+    live_reload_port: 35_738
   )
 
   # Asset digests allow you to set far-future HTTP expiration dates on all assets,