fix: accomodate aiortc 1.0 breaking change

aiortc 1.0 added a braking change addIceCandidate is now an async coroutine which is closer to the webrtc spec

Author: Ivelin Ivanov

src/peerjs/negotiator.py

@@ -322,7 +322,7 @@ async def handleCandidate(self, ice=None):
             rtc_ice_candidate.sdpMLineIndex = sdpMLineIndex
             log.debug('RTCIceCandidate: %r', rtc_ice_candidate)
             log.debug('peerConnection: %r', peerConnection)
-            peerConnection.addIceCandidate(rtc_ice_candidate)
+            await peerConnection.addIceCandidate(rtc_ice_candidate)
             log.debug('Added ICE candidate for peer %s',
                       self.connection.peer)
         except Exception as err: