Lexpy

Added support for Python 3.12

- Python version 3.7 or higher is required.
- Added support for Python 3.10 and dropped support for Python 3.6
- PEP 517 compliant build system. Introduced `setup.cfg` and `pyproject.toml`
- Continuous integration support using Github Actions
- Optimized the function `validate_expression()`
- Added Support for special characters. Characters other than `? `and `* `will be matched literally
- Simplified `add_all()` method
- Fixes issues https://github.com/aosingh/lexpy/issues/9 and https://github.com/aosingh/lexpy/issues/8

v.0.9.8
This is a maintenance release
- Bug Fix; `in` operator should return False when a word is not present in the lexicon
- Added support for Python 3.9
- Added support for PyPy 3
- Travis build matrix now includes Windows OS

- Removed support for Python 2. Going forward only Python 3 will be supported

- Added support for word counter

- Changed the DAWG DFA minimization process to support the word count feature

- Each Node's Hash code will now take into account the count flag to determine if 2 nodes are logically equivalent

- Improved Test coverage from 87 % to 93 %

- Minor Python performance tweaks

- Fix
- DAWG node id is issue

- Documentation