fix(README): update badges

Author: gr2m

README.md

@@ -1,13 +1,10 @@
 # hapi-cors-headers
 
-[![Greenkeeper badge](https://badges.greenkeeper.io/gr2m/hapi-cors-headers.svg)](https://greenkeeper.io/)
-
 > hapi extension to enable CORS
 
-[![NPM version](https://badge.fury.io/js/hapi-cors-headers.svg)](https://www.npmjs.com/package/hapi-cors-headers)
 [![Build Status](https://travis-ci.org/gr2m/hapi-cors-headers.svg?branch=master)](https://travis-ci.org/gr2m/hapi-cors-headers)
 [![Coverage Status](https://coveralls.io/repos/gr2m/hapi-cors-headers/badge.svg?branch=master)](https://coveralls.io/r/gr2m/hapi-cors-headers?branch=master)
-[![Dependency Status](https://david-dm.org/gr2m/hapi-cors-headers.svg)](https://david-dm.org/gr2m/hapi-cors-headers)
+[![Greenkeeper badge](https://badges.greenkeeper.io/gr2m/hapi-cors-headers.svg)](https://greenkeeper.io/)
 
 Enables [CORS](https://developer.mozilla.org/en-US/docs/Web/HTTP/Access_control_CORS) on
 all server response, securely from all origins, with `access-control-allow-credentials: true`.