v0.5.21

What's Changed

• Move test utility functions to test repo by @gammazero in #203
• update go-test by @gammazero in #204
• Update go-retryablehttp by @gammazero in #205
• Update go-libp2p by @gammazero in #208
• Use multiaddr http-path protocol by @gammazero in #210

Full Changelog: v0.5.20...v0.5.21