docs(readme): add Greenkeeper badge

https://greenkeeper.io/
kulshekhar · Mar 25, 2017 · c5c0406 · c5c0406
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diff --git a/README.md b/README.md
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 # ts-jest
 
+[![Greenkeeper badge](https://badges.greenkeeper.io/kulshekhar/ts-jest.svg)](https://greenkeeper.io/)
+
 [![NPM downloads](https://img.shields.io/npm/dm/ts-jest.svg?style=flat)](https://npmjs.org/package/ts-jest)
 [![Build Status for node v7](https://travis-badges.herokuapp.com/repos/kulshekhar/ts-jest/branches/master?job=0)](https://travis-ci.org/kulshekhar/ts-jest)
 [![Build Status for node v6](https://travis-badges.herokuapp.com/repos/kulshekhar/ts-jest/branches/master?job=1)](https://travis-ci.org/kulshekhar/ts-jest)