chore(dependencies): remove kabam-plugin-webrtc

According to this discussion, we treat this webRTC plugin as basic things we should have on Kabam:
https://github.com/mykabam/kabam/commit/fd12f7ba89c30e6dfbab5db4546674ba6fc66f29#commitcomment-4352547
Merge branch 'master' of github.com:mykabam/kabam-app