Add code style badge (#71)

* Add code style badge

* Move static badge to own line

README.md

@@ -4,6 +4,8 @@ Mocking
 [![Build Status](https://travis-ci.org/invenia/Mocking.jl.svg?branch=master)](https://travis-ci.org/invenia/Mocking.jl)
 [![codecov.io](http://codecov.io/github/invenia/Mocking.jl/coverage.svg?branch=master)](http://codecov.io/github/invenia/Mocking.jl?branch=master)
 
+[![Code Style: Blue](https://img.shields.io/badge/code%20style-blue-4495d1.svg)](https://github.com/invenia/BlueStyle)
+
 Allows Julia function calls to be temporarily overloaded for purpose of testing.
 
 Contents
@@ -105,4 +107,4 @@ re-defined, causing all methods dependent on `@mock` to be recompiled.
 License
 -------
 
-Mocking.jl is provided under the [MIT "Expat" License](LICENSE.md).
+Mocking.jl is provided under the [MIT "Expat" License](LICENSE.md).