* tool/merger.rb (tag): support 2.1.1 semi-automatic tagging and 2.2.0 explicit tagging.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44434 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* ChangeLog: reformatting for the previous commit.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44435 b2dd03c8-39d4-4d8f-98ff-823fe69b080e