This project heavily borrows code from go-libp2p-pubsub's codebase and therefore must
be subject to the license the pubsub repo utilizes. This has been kept verbatim for
reference:

This project is transitioning from an MIT-only license to a dual MIT/Apache-2.0 license. 
Unless otherwise noted, all code contributed prior to 2019-05-06 and not contributed by 
a user listed in [this signoff issue](https://github.com/ipfs/go-ipfs/issues/6302) is 
licensed under MIT-only. All new contributions (and past contributions since 2019-05-06) 
are licensed under a dual MIT/Apache-2.0 license.

MIT: https://www.opensource.org/licenses/mit
Apache-2.0: https://www.apache.org/licenses/license-2.0