message: Clean up package.json from previous runs
  Else wasm-pack crashes trying to read its own (old) file
diff: @@ -37,6 +37,7 @@ fn find_manifest_from_cwd() -> Result<PathBuf, failure::Error> {
  /// Construct our `pkg` directory in the crate.
  pub fn create_pkg_dir(out_dir: &Path) -> Result<(), failure::Error> {
  + let _ = fs::remove_file(out_dir.join("package.json")); // Clean up package.json from previous runs
  fs::create_dir_all(&out_dir)?;
  fs::write(out_dir.join(".gitignore"), "*")?;
  Ok(())
  