message: Add license to fluvio-smartstream-derive
  This was required in order to publish the crate to crates.io
diff: [package]
  name = "fluvio-smartstream-derive"
  version = "0.1.0"
  -authors = ["Fluvio Contributors <team@fluvio.io>"]
  edition = "2018"
  +license = "Apache-2.0"
  +authors = ["Fluvio Contributors <team@fluvio.io>"]
  categories = ["wasm", "database", "encoding"]
  keywords = ["streaming", "stream", "wasm", "fluvio"]
  repository = "https://github.com/infinyon/fluvio"
  