fix: include `index.{js,cjs}` in `file` of `package.json` (#98)
fix: include `index.{js,cjs}` in `file` of `package.json` (#98)

Otherwise Node and bundlers failed to find the entries
kenchris/urlpattern-polyfill,kenchris/urlpattern-polyfill,kenchris/urlpattern-polyfill