feat: Add `data_type` configuration to `PeerConnection.send_data`#200

mickel8 merged 2 commits intoelixir-webrtc:masterelixir-webrtc/ex_webrtc:masterfrom

SamWolfs:SamWolfs/data-channel-string-binarySamWolfs/ex_webrtc:SamWolfs/data-channel-string-binaryCopy head branch name to clipboard