Fix release badge

Author: garyb

README.md

@@ -1,6 +1,6 @@
 # purescript-unfoldable
 
-[![Latest release](http://img.shields.io/bower/v/purescript-.svg)](https://github.com/purescript/purescript-/releases)
+[![Latest release](http://img.shields.io/bower/v/purescript-unfoldable.svg)](https://github.com/purescript/purescript-unfoldable/releases)
 [![Build Status](https://travis-ci.org/purescript/purescript-unfoldable.svg?branch=master)](https://travis-ci.org/purescript/purescript-unfoldable)
 [![Dependency Status](https://www.versioneye.com/user/projects/55848c8f36386100150003f1/badge.svg?style=flat)](https://www.versioneye.com/user/projects/55848c8f36386100150003f1)