Update RuboCop to version 0.54

Close #46 and #48.

flame.gemspec

@@ -42,7 +42,7 @@ Gem::Specification.new do |s|
 	s.add_development_dependency 'rack-test', '~> 0'
 	s.add_development_dependency 'rack-utf8_sanitizer', '~> 1.3'
 	s.add_development_dependency 'rake', '~> 12'
-	s.add_development_dependency 'rubocop', '0.51'
+	s.add_development_dependency 'rubocop', '~> 0.54'
 	s.add_development_dependency 'simplecov', '~> 0'
 
 	s.files = Dir[File.join('{lib,public,template}', '**', '{*,.*}')]

spec/integration/app.rb

@@ -3,7 +3,6 @@
 require_relative File.join('..', 'spec_helper')
 
 require 'rack/test'
-include Rack::Test::Methods
 
 ## Exampe of application
 class IntegrationApp < Flame::Application

spec/integration/crud_spec.rb

@@ -31,6 +31,8 @@ class IntegrationApp
 end
 
 describe 'CRUD Controller' do
+	include Rack::Test::Methods
+
 	it 'should return list of items' do
 		get '/crud'
 		last_response.should.be.ok

spec/integration/custom_spec.rb

@@ -54,6 +54,8 @@ class IntegrationApp
 end
 
 describe CustomController do
+	include Rack::Test::Methods
+
 	it 'should return foo' do
 		get '/custom/foo'
 		last_response.should.be.ok

spec/integration/index_spec.rb

@@ -15,6 +15,8 @@ class IntegrationApp
 end
 
 describe IndexController do
+	include Rack::Test::Methods
+
 	it 'should return index' do
 		get '/'
 		last_response.should.be.ok