docs(readme): add Greenkeeper badge

rohmanhm · May 9, 2017 · 0571544 · 0571544
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diff --git a/README.md b/README.md
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 # Nullfined
+
+[![Greenkeeper badge](https://badges.greenkeeper.io/rohmanhm/nullfined.svg)](https://greenkeeper.io/)
  [![Build Status](https://travis-ci.org/rohmanhm/nullfined.svg?branch=master)](https://travis-ci.org/rohmanhm/nullfined)
 
 Convert null value from any type of value to undefined.