add inch badge

Author: slogsdon

README.md

@@ -2,6 +2,7 @@
 [![Build Status](https://img.shields.io/travis/slogsdon/elixir-http-router.svg?style=flat)](https://travis-ci.org/slogsdon/elixir-http-router)
 [![Coverage Status](https://img.shields.io/coveralls/slogsdon/elixir-http-router.svg?style=flat)](https://coveralls.io/r/slogsdon/elixir-http-router)
 [![Hex.pm Version](http://img.shields.io/hexpm/v/http_router.svg?style=flat)](https://hex.pm/packages/http_router)
+[![Inline docs](http://inch-ci.org/github/slogsdon/elixir-http-router.svg?branch=master)](http://inch-ci.org/github/slogsdon/elixir-http-router)
 
 > HTTP Router with various macros to assist in
 > developing your application and organizing