Typings for the package

Thank you for this project, it is really useful!

This package works fine when I install it. But typescript does not work with it. It seems like the `typings` field is incorrect. It is set to `"lib/index"`, but there is no such file in `node_modules/react-emojis/`. It would be very nice if this could be fixed so that people could use this project in their applications.

Thanks again!