style(readme): Added dependencies badge

Added dependencies state David badge

README.md

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 ## Videogular
 [![travis build](https://img.shields.io/travis/videogular/videogular2.svg)](https://travis-ci.org/videogular/videogular2)
 [![Gitter](https://badges.gitter.im/Join Chat.svg)](https://gitter.im/2fdevs/videogular?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+[![Dependency Status](https://david-dm.org/videogular/videogular2.svg)](https://david-dm.org/videogular/videogular2)
 
 **Videogular is an HTML5 video player for Angular 2.0**. Videogular is a wrapper over the HTML5 video tag, so you just could add whatever you want. This provides a very powerful, but simple to use solution, for everybody.