Make sure these boxes are checked! 📦✅

- [ ] You have the latest version of `rustfmt` installed and have your 
      cloned directory set to nightly
```bash
$ rustup override set nightly
$ rustup component add rustfmt-preview --toolchain nightly
```
- [ ] You ran `rustfmt` on the code base before submitting
- [ ] You reference which issue is being closed in the PR text

✨✨ 😄 Thanks so much for contributing to wasm-pack! 😄 ✨✨