libp2p still depend on deleted old version tag

[Yutong Pei]

https://github.com/libp2p/go-libp2p/blob/master/go.mod

	github.com/whyrusleeping/go-smux-multiplex v3.0.16+incompatible
	github.com/whyrusleeping/go-smux-multistream v2.0.2+incompatible
	github.com/whyrusleeping/go-smux-yamux v2.0.9+incompatible
	github.com/whyrusleeping/mdns v0.0.0-20180901202407-ef14215e6b30

libp2p is using deleted version tags.
This breaks all projects build depend on libp2p

[Steven Allen]

Ack. Working on a new release.

[Steven Allen]

All fixed.