v0.5.0-beta.9

Changelog:

• ⚠️ Protocol breaking changes (i.e. no interop with previous versions):
  • Bump dependency to zenoh 0.5.0-beta.9 (see its Changelog)
• ⚠️ ** API breaking changes**:
  • Renamed ZN_CONFIG_MULTICAST_ADDRESS_KEY to ZN_CONFIG_MULTICAST_IPV4_ADDRESS_KEY
• New features:
• Other changes:
  • Support Rust stable toolchain (#23 - thanks to @teburd)
  • Change build instructions (no longer need to pre-install cbindgen)

Available on:

• assets below or https://download.eclipse.org/zenoh/zenoh-c/0.5.0-beta.9/