Added code climate badge

My main Parser has been given an F, haha!! It's pretty damn hard to
write that bit "well", though...
Overall the score's not too bad, so I'll publish it :P

README.md

@@ -2,6 +2,7 @@
 [![Gem Version](https://badge.fury.io/rb/regexp-examples.svg)](http://badge.fury.io/rb/regexp-examples)
 [![Build Status](https://travis-ci.org/tom-lord/regexp-examples.svg?branch=master)](https://travis-ci.org/tom-lord/regexp-examples/builds)
 [![Coverage Status](https://coveralls.io/repos/tom-lord/regexp-examples/badge.svg?branch=master)](https://coveralls.io/r/tom-lord/regexp-examples?branch=master)
+[![Code Climate](https://codeclimate.com/github/tom-lord/regexp-examples/badges/gpa.svg)](https://codeclimate.com/github/tom-lord/regexp-examples)
 
 Extends the Regexp class with the methods: `Regexp#examples` and `Regexp#random_example`
 
@@ -111,7 +112,7 @@ Some of the most obscure regexp features are not even mentioned in the ruby docs
 ## Impossible features ("illegal syntax")
 
 The following features in the regex language can never be properly implemented into this gem because, put simply, they are not technically "regular"!
-If you'd like to understand this in more detail, check out what I had to say in [my blog post](http://tom-lord.weebly.com/blog/reverse-engineering-regular-expressions) about this gem!
+If you'd like to understand this in more detail, check out what I had to say in [my blog post](http://tom-lord.weebly.com/blog/reverse-engineering-regular-expressions) about this gem.
 
 Using any of the following will raise a RegexpExamples::IllegalSyntax exception: