v3.0.0

breaking changes:

• candidate.component is now a string rtp/rtcp instead of 1/2. See #26
• writeMediaSection is no more. See #30
• writeRtpDescription no longer adds a=rtcp-mux. See #46, use writeRtcpParameters
• writeIceParameters writes a=ice-lite, see #41. Note that writing ice-lite to media sections is violating the spec and rejected by Firefox