Update python-levenshtein with levenshtein

[BramVanroy]

python-levenshtein is not maintained and has been superseded by levenshtein. It includes the same functionality and also a C engine. Usage is the same. Updating to levenshtein should improve usability as it comes with prebuilt wheels and will continue to have support for at least the near future, which is good news for the fast iterations in Python development.

closes #60

[jitsi-jenkins]

Hi, thanks for your contribution!
If you haven't already done so, could you please make sure you sign our CLA (https://jitsi.org/icla for individuals and https://jitsi.org/ccla for corporations)? We would unfortunately be unable to merge your patch unless we have that piece :(.

[BramVanroy]

Hi, thanks for your contribution! If you haven't already done so, could you please make sure you sign our CLA (https://jitsi.org/icla for individuals and https://jitsi.org/ccla for corporations)? We would unfortunately be unable to merge your patch unless we have that piece :(.

Done.

[nikvaessen]

Bedankt voor de PR! :)

[BramVanroy]

Thanks for the quick integration!