Updating README to to md parser for gsg

README.md

@@ -14,6 +14,7 @@ You can use server side git hooks such as ``post-receive` to trigger gsgd.
 
 A `post-receive` script example:
 ```
+#!/bin/bash
 echo -ne "Regen\n" >> /some/path/to/talk.gsgd
 ```