Update appraisals for latest Gemfile

gemfiles/rails_42.gemfile

@@ -5,15 +5,10 @@ source "https://rubygems.org"
 gem "activesupport", "~> 4.2.7"
 group :development do
-  gem "rubocop"
-  gem "rubocop-rspec", "1.5.1"
-  gem "coveralls", :require => false
+  gem "rubocop", '~> 0.43.0'
+  gem "rubocop-rspec", '~> 1.8.0'
   gem "rspec", "~> 3.0"
-  gem "rspec-mocks"
-  gem "rspec-its"
   gem "webmock"
-  gem "guard"
-  gem "guard-rspec"
   gem "pry"
   gem "rake"
 end

gemfiles/rails_50.gemfile

@@ -5,15 +5,10 @@ source "https://rubygems.org"
 gem "activesupport", "~> 5.0.0"
 group :development do
-  gem "rubocop"
-  gem "rubocop-rspec", "1.5.1"
-  gem "coveralls", :require => false
+  gem "rubocop", '~> 0.43.0'
+  gem "rubocop-rspec", '~> 1.8.0'
   gem "rspec", "~> 3.0"
-  gem "rspec-mocks"
-  gem "rspec-its"
   gem "webmock"
-  gem "guard"
-  gem "guard-rspec"
   gem "pry"
   gem "rake"
 end