message: Update README.md
  Mention gltfpack in a bit more prominent location
diff: @@ -6,6 +6,8 @@ When a GPU renders triangle meshes, various stages of the GPU pipeline have to p
  The library provides a C and C++ interface for all algorithms; you can use it from C/C++ or from other languages via FFI (such as P/Invoke). If you want to use this library from Rust, you should use [meshopt crate](https://crates.io/crates/meshopt).
  +[gltfpack](#gltfpack), which is a tool that can automatically optimize glTF files, is developed and distributed alongside the library.
  +
  ## Installing
  meshoptimizer is hosted on GitHub; you can download the latest release using git:
  