v1.0.0-beta.4

The last beta before the release of v1.0.0 🎉 outdated :(

• Reuse sockets from resolve-alpn (HTTP1 only for now) e4d88fc
• Various performance improvements:
  • 23ac4bb
  • 8dc4518
  • 4f52768
  • 0f71a33
• API behavior change: Agent.normalizeAuthority(..) -> Agent.normalizeOrigin(...)
• Readme fixes