tqdm v4.50.1 stable

tqdm-bot released this 07 Oct 12:11

fix multiprocessing lock creation leak (#982, #936, #759)
- fixes #617 which introduced this bug (v4.29.0, released 2019-01-06, undiagnosed until now) where multiple threads could concurrently create and append process locks to a global list, then try to release them without first acquiring 👿
major test overhaul: fix, update, and speed up
misc CI framework updates
code linting
minor documentation tidy

Assets 4