message: Add missing cargo fields
diff: name = "async-nats"
  version = "0.11.0"
  edition = "2021"
  +description = "A async Rust NATS client"
  +license = "Apache-2.0"
  +documentation = "https://docs.rs/async-nats"
  +homepage = "https://github.com/nats-io/nats.rs"
  +repository = "https://github.com/nats-io/nats.rs"
  +readme = "README.md"
  +keywords = ["nats", "client", "messaging", "api"]
  +categories = ["network-programming", "api-bindings"]
  [dependencies]
  subslice = "0.2.3"
  