Fix node engine requirement

v3.0.1

bump to 3.0.1

Adapter 3.0 - Major getStats() overhaul

Details in https://groups.google.com/d/topic/discuss-webrtc/OXqm0tjg8hs/discussion

Add support for addIceCandidate(undefined) and don't shim maplike getStats in Firefox past 47

v2.1.0

bump to 2.1.0

Update required NPM engine version

v2.0.8

bump to 2.0.8

Edge: add enabled event to MediaStreamTrack

v2.0.7

bump to 2.0.7

Edge: add getConfiguration, add profile level asymmetry flag to H264, Chrome/FF: addIceCandidate(null): call callbacks

v2.0.6

bump to 2.0.6

edge: remove rtx from recv encoding parameters

v2.0.5

bump to 2.0.5

edge: ignore RTX until it is fully implemented

v2.0.4

bump to 2.0.4

Reject datachannels for edge

v2.0.3

bump to 2.0.3

Adapter 2.0.0 release removes attach/reattachMediaStream helper methods + fix loads of edge issues

Details in #352