node-shim/publish-subscribe test passes inconsistently

[ReidWilliams]

Failure mode appears to be not successfully dialing publishing peer. Seems to work about 80% - 90% of the time.

[ReidWilliams]

This may be caused by incorrectly setting up the WebRTCStar transport:
libp2p/js-libp2p-webrtc-star#85