message: rage: Remove README note about binaries in age crate
  The binaries were moved out of the age crate in 0.3.0 in early 2020, so
  we can assume users will find the rage crate now.
diff: @@ -136,9 +136,6 @@ encrypted to a specific public key.
  On Windows, Linux, and macOS, you can use the
  [pre-built binaries](https://github.com/str4d/rage/releases).
  -> Note: previously the `rage` suite of tools was provided in the `age` Rust
  -> crate. This is no longer the case; `age` now only contains the Rust library.
  -
  Help from new packagers is very welcome.
  ### Feature flags
  