docs(readme): add Greenkeeper badge

DrPaulBrewer · Oct 17, 2017 · 2b858f6 · 2b858f6
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diff --git a/README.md b/README.md
@@ -1,5 +1,7 @@
 positive-number-array
 ----------
+
+[![Greenkeeper badge](https://badges.greenkeeper.io/DrPaulBrewer/positive-number-array.svg)](https://greenkeeper.io/)
 [![Build Status](https://travis-ci.org/DrPaulBrewer/positive-number-array.svg?branch=master)](https://travis-ci.org/DrPaulBrewer/positive-number-array)
 [![Coverage Status](https://coveralls.io/repos/github/DrPaulBrewer/positive-number-array/badge.svg?branch=master)](https://coveralls.io/github/DrPaulBrewer/positive-number-array?branch=master)