brew vendor-gems: commit updates.

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

...ndle/ruby/2.6.0/gems/rexml-3.2.4/lib/rexml/attlistdecl.rb

...bundle/ruby/2.6.0/gems/rexml-3.2.4/lib/rexml/attribute.rb

...dor/bundle/ruby/2.6.0/gems/rexml-3.2.4/lib/rexml/cdata.rb

...dor/bundle/ruby/2.6.0/gems/rexml-3.2.4/lib/rexml/child.rb

...r/bundle/ruby/2.6.0/gems/rexml-3.2.4/lib/rexml/comment.rb

...r/bundle/ruby/2.6.0/gems/rexml-3.2.4/lib/rexml/doctype.rb

.../bundle/ruby/2.6.0/gems/rexml-3.2.4/lib/rexml/document.rb

.../ruby/2.6.0/gems/rexml-3.2.4/lib/rexml/dtd/attlistdecl.rb

...r/bundle/ruby/2.6.0/gems/rexml-3.2.4/lib/rexml/dtd/dtd.rb

.../ruby/2.6.0/gems/rexml-3.2.4/lib/rexml/dtd/elementdecl.rb

...e/ruby/2.6.0/gems/rexml-3.2.4/lib/rexml/dtd/entitydecl.rb

...ruby/2.6.0/gems/rexml-3.2.4/lib/rexml/dtd/notationdecl.rb

...r/bundle/ruby/2.6.0/gems/rexml-3.2.4/lib/rexml/element.rb

.../bundle/ruby/2.6.0/gems/rexml-3.2.4/lib/rexml/encoding.rb

...or/bundle/ruby/2.6.0/gems/rexml-3.2.4/lib/rexml/entity.rb

...by/2.6.0/gems/rexml-3.2.4/lib/rexml/formatters/default.rb

...uby/2.6.0/gems/rexml-3.2.4/lib/rexml/formatters/pretty.rb

...2.6.0/gems/rexml-3.2.4/lib/rexml/formatters/transitive.rb

...bundle/ruby/2.6.0/gems/rexml-3.2.4/lib/rexml/functions.rb