Unbreak tag push on release.

Author: bernd

Rakefile

@@ -100,7 +100,7 @@ task :release => :build do
   sh "git commit --allow-empty -a -m 'Release #{version}'"
   sh "git tag v#{version}"
   sh "git push origin master"
-  sh "git push v#{version}"
+  sh "git push origin tag v#{version}"
   sh "gem push pkg/#{name}-#{version}.gem"
 end