message: age: Fix crate description
  It's a library :)
diff: [package]
  name = "age"
  -description = "[BETA] A simple, secure, and modern encryption tool."
  +description = "[BETA] A simple, secure, and modern encryption library."
  version = "0.4.0"
  authors = ["Jack Grigg <thestr4d@gmail.com>"]
  repository = "https://github.com/str4d/rage"
  