docs(readme): add Greenkeeper badge

https://greenkeeper.io/
bootprint · Feb 17, 2017 · 6a08da2 · 6a08da2
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commit 6a08da2
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diff --git a/README.md b/README.md
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 # bootprint-openapi 
 
+[![Greenkeeper badge](https://badges.greenkeeper.io/bootprint/bootprint-openapi.svg)](https://greenkeeper.io/)
+
 [![NPM version](https://badge.fury.io/js/bootprint-openapi.svg)](http://badge.fury.io/js/bootprint-openapi)
 [![Travis Build Status](https://travis-ci.org/bootprint/bootprint-openapi.svg?branch=master)](https://travis-ci.org/bootprint/bootprint-openapi)
 [![Coverage Status](https://img.shields.io/coveralls/bootprint/bootprint-openapi.svg)](https://coveralls.io/r/bootprint/bootprint-openapi)