🚨Fix Rubocop lint errors

Gemfile

@@ -3,24 +3,22 @@ source 'https://rubygems.org'
 ruby '2.6.3'
 
 ##-- base gems for rails --##
-gem 'rails', '~> 6', github: 'rails/rails'
 gem 'rack-cors', require: 'rack/cors'
+gem 'rails', '~> 6', github: 'rails/rails'
 # Reduces boot times through caching; required in config/boot.rb
 gem 'bootsnap', require: false
 gem 'therubyracer', platforms: :ruby
 
-
 ##-- rails helper gems --##
-gem 'responders'
-gem 'valid_email2'
+gem 'acts-as-taggable-on', git: 'https://github.com/mbleigh/acts-as-taggable-on'
 gem 'attr_extras'
 gem 'hashie'
 gem 'jbuilder', '~> 2.5'
 gem 'kaminari'
+gem 'responders'
 gem 'time_diff'
 gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
-gem 'acts-as-taggable-on', git: 'https://github.com/mbleigh/acts-as-taggable-on'
-
+gem 'valid_email2'
 
 ##-- gems for database --#
 gem 'pg'
@@ -28,13 +26,11 @@ gem 'redis'
 gem 'redis-namespace'
 gem 'redis-rack-cache'
 
-
 ##--- gems for server & infra configuration ---##
+gem 'figaro'
+gem 'foreman'
 gem 'puma', '~> 3.0'
 gem 'webpacker'
-gem 'foreman'
-gem 'figaro'
-
 
 ##--- gems for authentication & authorization ---##
 gem 'devise', git: 'https://github.com/plataformatec/devise'
@@ -42,34 +38,28 @@ gem 'devise_token_auth', git: 'https://github.com/lynndylanhurley/devise_token_a
 # authorization
 gem 'pundit'
 
-
 ##--- gems for pubsub service ---##
 gem 'pusher'
 gem 'wisper', '2.0.0'
 
-
 ##--- gems for reporting ---##
 gem 'nightfury', '~> 1.0', '>= 1.0.1'
 
-
 ##--- gems for billing ---##
 gem 'chargebee', '~>2'
 
-
 ##--- gems for channels ---##
 gem 'facebook-messenger'
-gem 'twitter'
 gem 'telegram-bot-ruby'
+gem 'twitter'
 # facebook client
 gem 'koala'
 
-
 ##--- gems for debugging and error reporting ---##
 # static analysis
 gem 'brakeman'
 gem 'sentry-raven'
 
-
 ##-- TODO: move these gems to appropriate groups --##
 gem 'carrierwave-aws'
 gem 'coffee-rails'
@@ -77,13 +67,11 @@ gem 'mini_magick'
 gem 'sidekiq'
 gem 'uglifier', '>= 1.3.0'
 
-
 group :development do
   gem 'letter_opener'
   gem 'web-console'
 end
 
-
 group :test do
   gem 'mock_redis'
   gem 'shoulda-matchers'
@@ -100,4 +88,4 @@ group :development, :test do
   gem 'seed_dump'
   gem 'spring'
   gem 'spring-watcher-listen'
-end
+end