Switch to 2-0-stable branch of bundler/bundler repository from our fork repository.
https://github.com/bundler/bundler/tree/2-0-stable
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65770 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Switch to 2-0-stable branch of bundler/bundler repository from our fork repository.
https://github.com/bundler/bundler/tree/2-0-stable
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65770 b2dd03c8-39d4-4d8f-98ff-823fe69b080e