Bpmn-parser

Changes
- Bumped version to v1.0.16
- Performance: added `self._items` property and setting this value just once the BPMN is loaded.
- Tests: validating `del` of items to free up memory.

Changes
- Bumped version to v1.0.15
- Docs: adjusted docstring of `file_path` from BPMNParser

Changes
- Bumped version to v1.0.14
- Feat: Added `__repr__` and `__len__` in `Task` base class.
- Refactor: added `get` method in `Task` base class and removed from inherited classes.
- Tests: validating `__repr__` and `__len__` methods.
- Docs: added `__repr__` documentation
- Build: installing python 3.9 when use pyenv.

Changes
- Bumped version to v1.0.13
- Using "Issues" instead "Bug" in issues url.

Changes
- Bumped version to v1.0.12
- Added project urls in `pyproject.toml`

Changes
- Bumped version to v1.0.11
- Added env in pypi publiser