Use billiard instead of multiprocessing #2
Merged
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Problem
Multiprocessing lib is causing this library to be unusable in celery
environment, due to celery worker daemon process can't spawn another
child.
While spawning another child is important, because opening
pylokit.Office more than once can cause system exit 77 / 139.
Solution
Replace multiprocessing with billiard since billiard is supported to run on celery and will still run outside of celery worker.
Reference
kiawin#3