Logtail-python

What's Changed
* Allow custom log levels by talcot in https://github.com/logtail/logtail-python/pull/14


**Full Changelog**: https://github.com/logtail/logtail-python/compare/v0.2.3...v0.2.5

What's Changed

Improvements for serverless environments:
- Use flush thread per process to avoid issues with multiprocessing on serverless
- Delay worker init (fixes "threads can only be started once" errors)

**Full Changelog**: https://github.com/logtail/logtail-python/compare/v0.1.4...v0.2.0