Release with DTMF fix (https://github.com/react-native-webrtc/react-native-webrtc/pull/642)

[venkata.kuna]

Any plans to merge DTMF fix add sending of dtmf ability by danjenkins · Pull Request #642 · react-native-webrtc/react-native-webrtc · GitHub and create a release version?

That fix is useful support DTMF.