Ruby 2.6 (and remove backports) gems

.gitignore

Library/Homebrew/Gemfile

Library/Homebrew/Gemfile.lock

Library/Homebrew/extend/string.rb

Library/Homebrew/vendor/bundle/bundler/setup.rb

.../bundle/ruby/2.3.0/gems/backports-3.15.0/lib/backports.rb

...0/gems/backports-3.15.0/lib/backports/2.4.0/comparable.rb

...0/gems/backports-3.15.0/lib/backports/2.4.0/enumerable.rb

.../gems/backports-3.15.0/lib/backports/2.4.0/false_class.rb

...2.3.0/gems/backports-3.15.0/lib/backports/2.4.0/fixnum.rb

.../2.3.0/gems/backports-3.15.0/lib/backports/2.4.0/float.rb

...y/2.3.0/gems/backports-3.15.0/lib/backports/2.4.0/hash.rb

....0/gems/backports-3.15.0/lib/backports/2.4.0/nil_class.rb

...2.3.0/gems/backports-3.15.0/lib/backports/2.4.0/regexp.rb

...2.3.0/gems/backports-3.15.0/lib/backports/2.4.0/string.rb

...gems/backports-3.15.0/lib/backports/2.4.0/string/match.rb

...0/gems/backports-3.15.0/lib/backports/2.4.0/true_class.rb

.../2.3.0/gems/backports-3.15.0/lib/backports/2.5.0/array.rb

...by/2.3.0/gems/backports-3.15.0/lib/backports/2.5.0/dir.rb

...0/gems/backports-3.15.0/lib/backports/2.5.0/enumerable.rb