added dependency-ci badge

Author: bmcfee

README.md

@@ -3,6 +3,7 @@
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 [![Build Status](https://travis-ci.org/bmcfee/resampy.png?branch=master)](http://travis-ci.org/bmcfee/resampy?branch=master)
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 [![Documentation Status](https://readthedocs.org/projects/resampy/badge/?version=latest)](http://resampy.readthedocs.org/en/latest/?badge=latest)
 
 Efficient audio resampling in Python / Cython.