Pybmkg

* rename `exception.py` to `exceptions.py`
* improve docs


**Full Changelog**: https://github.com/kiraware/PyBMKG/compare/1.0.0...2.0.0

This update is major breaking changes. We change the design pattern to facade design pattern hence improve user experience.

This release includes
- updating `Enum` to `StrEnum` and `IntEnum`
- use `base_url` argument in `ClientSession`
- update some dependency
- update docs

PR
- https://github.com/kiraware/PyBMKG/pull/3

This is released just to allow new release on PyPi. Basically just the same with v0.1.0.