Revert "add release badge"

This reverts commit 9cbe0a1.

Author: bkw

README.md

@@ -1,6 +1,5 @@
 # ssh-hardening (Chef cookbook)
 
-![Release](http://img.shields.io/github/release/TelekomLabs/chef-ssh-hardening.svg)
 ![Supermarket](http://img.shields.io/cookbook/v/ssh-hardening.svg)
 ![Build Status](http://img.shields.io/travis/TelekomLabs/chef-ssh-hardening.svg)
 ![Code Coverage](http://img.shields.io/coveralls/TelekomLabs/chef-ssh-hardening.svg)