update maintainability link in README

Author: rpearce

README.md

@@ -1,7 +1,7 @@
 # flexible-string-replace
 [![All Contributors](https://img.shields.io/badge/all_contributors-1-orange.svg?style=flat-square)](#contributors)
 [![All Contributors](https://img.shields.io/badge/all_contributors-0-orange.svg?style=flat-square)](#contributors)
-[![npm version](https://img.shields.io/npm/v/@rpearce/flexible-string-replace.svg)](https://www.npmjs.com/package/@rpearce/flexible-string-replace) [![npm downloads](https://img.shields.io/npm/dt/@rpearce/flexible-string-replace.svg)](https://www.npmjs.com/package/@rpearce/flexible-string-replace) [![Build Status](https://travis-ci.org/rpearce/flexible-string-replace.svg?branch=master)](https://travis-ci.org/rpearce/flexible-string-replace) [![Coverage Status](https://coveralls.io/repos/github/rpearce/flexible-string-replace/badge.svg?branch=master)](https://coveralls.io/github/rpearce/flexible-string-replace?branch=master) [![Maintainability](https://api.codeclimate.com/v1/badges/8e4debef4b9f0e8acd6e/maintainability)](https://codeclimate.com/github/rpearce/flexible-string-replace/maintainability)
+[![npm version](https://img.shields.io/npm/v/@rpearce/flexible-string-replace.svg)](https://www.npmjs.com/package/@rpearce/flexible-string-replace) [![npm downloads](https://img.shields.io/npm/dt/@rpearce/flexible-string-replace.svg)](https://www.npmjs.com/package/@rpearce/flexible-string-replace) [![Build Status](https://travis-ci.org/rpearce/flexible-string-replace.svg?branch=master)](https://travis-ci.org/rpearce/flexible-string-replace) [![Coverage Status](https://coveralls.io/repos/github/rpearce/flexible-string-replace/badge.svg?branch=master)](https://coveralls.io/github/rpearce/flexible-string-replace?branch=master) [![Maintainability](https://api.codeclimate.com/v1/badges/ca092c1e9dfe10b455d7/maintainability)](https://codeclimate.com/github/rpearce/flexible-string-replace/maintainability)
 
 ## Links
 * [`API Documentation`](./API.md)
@@ -20,4 +20,4 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
 
 <!-- ALL-CONTRIBUTORS-LIST:END -->
 
-This project follows the [all-contributors](https://github.com/all-contributors/all-contributors) specification. Contributions of any kind welcome!
+This project follows the [all-contributors](https://github.com/all-contributors/all-contributors) specification. Contributions of any kind welcome!