upgrade-link-v1.2.8-v1.2.9

Upgrading Link instances from v1.2.8 to v1.2.9

Webrtc dialer support added

Webrtc dialer can be used if your application works via the https protocol(sip with web proxy) and the browser is allowed to use a microphone, camera and notifications.

In addition, you must use the latest docker-compose.yaml configuration file.

Thanks