Rakefile in gitdoc-3.13.0 vs Rakefile in gitdoc-4.0.0

@@ -9,5 +9,9 @@
 end
 
 task :tag do
   sh "git tag -a v`cat VERSION` `git rev-parse HEAD` -m ''"
 end
+
+task :release do
+  sh "gem push #{gemfile}"
+end