message: Update EasyRTCClient for 0.8.9
diff: /**
  * An AVClient implementation that uses WebRTC and the EasyRTC library.
  - */
  + * This client is deprecated and will be removed entirely in 0.9.x.
  + *
  + * If you wish to continue using it, you will need to manually enable it by:
  + * 1. Include the easyrtc.js library which is no longer served
  + * 2. Set CONFIG.WebRTC.clientClass = EasyRTCClient
  + *
  + * @deprecated since 0.8.7 */
  declare class EasyRTCClient extends AVClient {
  /**
  * @param master - The master orchestration instance
  