merger.rb: show procedure to push tag into GitHub

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53029 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

tool/merger.rb

@@ -145,6 +145,8 @@ def tag intv_p = false, relname=nil
     end
   end
   system(*%w'svn cp -m', "add tag #{tagname}", branch_url, tag_url)
+  puts "run following command in git-svn working directory to push the tag into GitHub:"
+  puts "git tag #{tagname}  origin/tags/#{tagname} && git push ruby #{tagname}"
 end
 
 def default_merge_branch