serverless version number change.

Author: mjzone

README.md

@@ -10,7 +10,7 @@ For [email protected] installation and documentation [please see v1 branch](htt
 
 Following instructions are for [email protected]
 ## This Plugin Requires
-* Serverless V0.5 or newer
+* Serverless V0.5.x
 * Java Runtime Engine (JRE) version 6.x or newer
 
 ## Features