Preparing for 4.0.0, part II

Another pre-release to see whether the Python wheel makes for a better experience. It should both be easier to install and faster to start.

To install rofimoji with a wheel, download the attached file and call pip install rofimoji-4.0.0-py3-none-any.whl
As always, if you have problems or ideas, please open an issue or a PR!

Thanks, once more, to @polyzen for his help!