Update README.md

Author: paf31

README.md

@@ -1,5 +1,8 @@
 # purescript-nullable
 
+[![Latest release](http://img.shields.io/bower/v/purescript-nullable.svg)](https://github.com/purescript-contrib/purescript-nullable/releases)
+[![Maintainer: paf31](https://img.shields.io/badge/maintainer-paf31-lightgrey.svg)](http://github.com/paf31)
+
 A library for dealing with null values in foreign libraries.
 
 ## Installing