message: Add link to pre-built binaries in README
diff: @@ -35,6 +35,9 @@ Optional arguments:
  ## Installation
  +On Windows, Linux, and macOS, you can use the
  +[pre-built binaries](https://github.com/str4d/rage/releases).
  +
  The `rage` suite of tools are provided in the `age` Rust crate. If your system
  has Rust 1.37+ installed (either via `rustup` or a system package), you can
  build directly from source:
  