Merge rubygems-3.0.2.
https://blog.rubygems.org/2019/01/01/3.0.2-released.html
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66678 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Merge rubygems-3.0.2.
https://blog.rubygems.org/2019/01/01/3.0.2-released.html
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66678 b2dd03c8-39d4-4d8f-98ff-823fe69b080e