Remove bundler version in Gemfile.lock
Remove bundler version in Gemfile.lock

https://twitter.com/schneems/status/1179413794583392257

instacart/heroku-buildpack-ruby,heroku/heroku-buildpack-ruby,Scalingo/ruby-buildpack,Genius/heroku-buildpack-ruby,brightbytes/heroku-buildpack-ruby-without-assets-precompile,zunda/heroku-buildpack-ruby,zunda/heroku-buildpack-ruby,Scalingo/ruby-buildpack,heroku/heroku-buildpack-ruby,makifund/heroku-buildpack-ruby,brightbytes/heroku-buildpack-ruby-without-assets-precompile,instacart/heroku-buildpack-ruby,makifund/heroku-buildpack-ruby,Genius/heroku-buildpack-ruby