Changes from the previous release: ([diff](https://github.com/alphatwirl/atpbar/compare/v1.0.9...v1.1.0))
- reimplemented the logic in `funcs.py` with a state machine [17](https://github.com/alphatwirl/atpbar/pull/17)
- optimized the brief sleep of pickup
- cleaned code
- updated `setup.py`, tests
- made the number of iterations in examples smaller
- set start method of `multiprocessing` in an example for Python 3.8
- removed code for Python 2.7