Merge pull request #500 from jitsi/bump-sdp-interop-simulcast

Update sdp-interop and sdp-simulcast to latest.

package.json

     "jitsi-meet-logger": "jitsi/jitsi-meet-logger",
     "jssha": "1.5.0",
     "retry": "0.6.1",
-    "sdp-interop": "0.1.11",
-    "sdp-simulcast": "0.2.0",
+    "sdp-interop": "0.1.12",
+    "sdp-simulcast": "0.2.1",
     "sdp-transform": "2.3.0",
     "socket.io-client": "1.4.5",
     "strophe": "1.2.4",