chore: use david-dm dependencies badge

Author: bufferoverflow

README.md

@@ -1,4 +1,5 @@
-Mosca   [![Build Status](https://travis-ci.org/mcollina/mosca.svg)](https://travis-ci.org/mcollina/mosca)  [![Coverage Status](https://coveralls.io/repos/mcollina/mosca/badge.svg)](https://coveralls.io/r/mcollina/mosca)
+Mosca   [![Build Status](https://travis-ci.org/mcollina/mosca.svg)](https://travis-ci.org/mcollina/mosca)  [![Coverage Status](https://coveralls.io/repos/mcollina/mosca/badge.svg)](https://coveralls.io/r/mcollina/mosca) [![dependencies Status](https://david-dm.org/mcollina/mosca/status.svg)](https://david-dm.org/mcollina/mosca)
+
 ====================
 
 [![MOSCA](http://cloud.dynamatik.com/image/3I3I0q1M1x0E/mosca_small.png)](https://github.com/mcollina/mosca)