Update readme.md

Author: stephenlb

readme.md

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 # WebRTC V2 Simple Calling API + Mobile
 
+[![Known Vulnerabilities](https://snyk.io/test/npm/webrtc-sdk/badge.svg)](https://snyk.io/test/npm/webrtc-sdk)
+[![npm](https://img.shields.io/npm/v/webrtc-sdk.svg)]()
+[![Bower](https://img.shields.io/bower/v/webrtc-sdk.svg)]()
+
 > WebRTC SDK Upgraded! ES6, new camera control and 100x less JS.
 
 At PubNub we believe simplicity is essential for our SDK usability.