Updates:
* cid, multihash, and multiaddr to ensure that minimal varints are used.
* log to deduplicate some code between version 2 and version 1.
* multistream to avoid writing from multiple threads.
* badger/datastore to harden prefix handling in queries.
* libp2p to 0.5.2
BREAKING:
The new libp2p version now formats addresses with /p2p instead of /ipfs. /ipfs
multiaddrs are still supported.
