Bump version to 1.9.5.1

There was a `v1.9.5` tag that was pushed with the wrong version so now we have
to have a different one.

Author: carlosmn

lib/rugged/version.rb

@@ -4,5 +4,5 @@
 # For full terms see the included LICENSE file.
 
 module Rugged
-  Version = VERSION = '1.9.5'
+  Version = VERSION = '1.9.5.1'
 end