v0.4.2

What's Changed

• relay: add relay-side HOP and STOP wire machines by @deepso7 in #73
• feat: add sans-I/O circuit relay v2 server by @deepso7 in #74
• Integrate Circuit Relay v2 server into Endpoint by @deepso7 in #75
• Ship relay server hosting, interop, docs, and CI by @deepso7 in #76

Full Changelog: v0.4.1...v0.4.2