Merge pull request #3349 from reitermarkus/rubocop-0.51

Library/.rubocop.yml

Library/Homebrew/caveats.rb

Library/Homebrew/cleanup.rb

Library/Homebrew/constants.rb

Library/Homebrew/diagnostic.rb

Library/Homebrew/formulary.rb

Library/Homebrew/language/python.rb

Library/Homebrew/readall.rb

Library/Homebrew/rubocops/checksum_cop.rb

Library/Homebrew/rubocops/conflicts_cop.rb

Library/Homebrew/rubocops/extend/formula_cop.rb

Library/Homebrew/rubocops/formula_desc_cop.rb

Library/Homebrew/rubocops/lines_cop.rb

Library/Homebrew/test/Gemfile.lock

Library/Homebrew/test/rubocops/bottle_block_cop_spec.rb

Library/Homebrew/test/rubocops/caveats_cop_spec.rb

Library/Homebrew/test/rubocops/checksum_cop_spec.rb

Library/Homebrew/test/rubocops/class_cop_spec.rb

Library/Homebrew/test/rubocops/components_order_cop_spec.rb

.../Homebrew/test/rubocops/components_redundancy_cop_spec.rb