message: Add instructions for options
diff: @@ -52,3 +52,5 @@ Here's an example of running only tests that contain the world "apple".
  ```
  wasm-pack test --firefox --headless -- --manifest-path=crates/my-workspace-crate/Cargo.toml apple
  ```
  +
  +`cargo test -h` for a list of all options that you can pass through.
  