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This happens when there are multiple subscriptions to a topic and a single subscription is canceled twice.

* Update README to point to correct example directory

* Fix example url to go example instead of js

fixes #264

Co-authored-by: nisdas <nishdas93@gmail.com>

* RIP travis

* add CircleCI config

So that locally published messages are never dropped because of full
validation queues.

This message will be received on reconnect and/or when we receive multiple
connections. It apparently shows up in logs quite frequently.

fix: treat peers already connected to the host before pubsub is initialized as valid potential pubsub peers

Updates to the new stream interfaces. See
https://github.com/libp2p/go-libp2p-core/releases/tag/v0.7.0.