What's Changed
* refactorize model classes, handle invalid polygons, minor improvements by fcakyon in https://github.com/obss/sahi/pull/311
* refactor tests and coco utils by fcakyon in https://github.com/obss/sahi/pull/313
* fix nms postprocess by fcakyon in https://github.com/obss/sahi/pull/314
* update predict verbose by fcakyon in https://github.com/obss/sahi/pull/317
* print exports dirs after process finishes by fcakyon in https://github.com/obss/sahi/pull/318
**Full Changelog**: https://github.com/obss/sahi/compare/0.8.15...0.8.16