Updated README.md link for reference documentation
Updated README.md link for reference documentation

RestComm/restcomm-web-sdk,Mobicents/restcomm-webrtc-sdk,RestComm/restcomm-web-sdk,Mobicents/restcomm-webrtc-sdk,Mobicents/restcomm-webrtc-sdk,Mobicents/restcomm-webrtc-sdk,RestComm/restcomm-web-sdk,RestComm/restcomm-web-sdk