Added sample code of merge! method in hash.c.
https://github.com/ruby/ruby/pull/1652
Patch by @selmertsx [fix GH-1652]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60273 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Added sample code of merge! method in hash.c.
https://github.com/ruby/ruby/pull/1652
Patch by @selmertsx [fix GH-1652]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60273 b2dd03c8-39d4-4d8f-98ff-823fe69b080e