The library needs a version

[bast]

It would be good to give this code a version. This will make it easier for me to version the Python package accordingly.

[eloraiby]

Indeed, I will review your changes this weekend and add another option to the api to filter illegal input.

[bast]

Great. No rush. I am working on the Python interface. Looks good but want to test it more on my fork before contributing it.