This patch updates go-libp2p for the stream interface changes in go-libp2p-core
0.7.0. This is a _significant_ breaking change to streams and all users should
read https://github.com/libp2p/go-libp2p-core/releases/tag/v0.7.0. In practice,
this change should remove a significant footgun.

TL;DR:

* `Stream.Close` now behaves like `net.TCPConn.Close`.
* There is a new `Stream.CloseWrite` (send an EOF) and `Stream.CloseRead` (close
  for reading), behaving like their counterparts in `net.TCPConn`.
Users who have contributed to this file
