Rename `-rubygerms` option. It only needs with Ruby 1.8 and Ruby 2.5 will remove it.
Rename `-rubygerms` option. It only needs with Ruby 1.8 and Ruby 2.5 will remove it.

  Picked r60125 from ruby/ruby:
  https://github.com/ruby/ruby/commit/9de6c712b66aad77df40661c1fc6d37e9a5c251a

dilumnavanjana/bundler,mvz/bundler,mvz/bundler,bundler/bundler,bundler/bundler,dilumnavanjana/bundler