Add v4 Release Notes to README

Add missing a=ssrc lines for RTX/FEC

Pion extracts them from ssrc-group line so this didn't failed
Pion<->Pion. Chrome/FireFox uses the dedicated a=ssrc lines and our
Offer/Answer would break negotation

Fixes #2922

Update module github.com/pion/interceptor to v0.1.37

Generated by renovateBot

Update ICE version

Update module github.com/pion/dtls/v3 to v3.0.3

Generated by renovateBot

Add E2E Test for RTX

Assert that generation of NACKs and sending of RTX operates as expected.

Send Abort In SCTP Close

Sending Abort message to follow WebRTC standard

Update ICE

Return object icluding stat id for selected pair

Returning the object with stat id is useful when cross-referencing
stats.

Don't reuse transceiver in one round negotiation

Should not reuse transceiver (remove & add track)
in one round negotiation, it cause the transceiver
changes ssrc/id without transit to inactive and the
remote peer connection can't fire track close and
OnTrack event.