npm, codeship, greenkeeper badges (#3)

Author: glebec

README.md

@@ -1,3 +1,6 @@
+[![npm version](https://img.shields.io/npm/v/eslint-config-fullstack.svg?maxAge=3600)](https://www.npmjs.com/package/send-seekable)
+[![Codeship](https://img.shields.io/codeship/4ae0bfb0-1c07-0134-222f-22fb94432a98.svg)](https://codeship.com/projects/154589)
+[![Greenkeeper.io is keeping this repo's dependencies up to date](https://img.shields.io/badge/greenkeeper.io-monitoring-brightgreen.svg?maxAge=3600)](https://greenkeeper.io/)
 [![Built at Fullstack Academy](https://img.shields.io/badge/built%20at-Fullstack%20Academy-green.svg)](http://www.fullstackacademy.com)
 
 ![ESLint-Fullstack logo](https://learndotresources.s3.amazonaws.com/workshop/570bdee44a306c0300b78b52/eslint-fullstack.jpg)