Pytest-check

Fixed

- [issue 80](https://github.com/okken/pytest-check/issues/80) --tb=no should remove tracebacks from xml output

Fixed

- [issue 55](https://github.com/okken/pytest-check/issues/55) a problem with multiple drive letters.
- code is using `os.path.relpath()`, but sometimes it can fail.
- when it does fail, fall back to `os.path.abspath()`.
- thanks [rloutrel](https://github.com/rloutrel) and [kr1zo](https://github.com/kr1zo) for your patience and persistence, and for the solution.

Fixed

- Support check failures not blowing up if called outside of a test.
- should also fix [85](https://github.com/okken/pytest-check/issues/85)
- thanks [zerocen](https://github.com/zerocen) for the excellent toy example that helped me to get this fixed quickly.

Changed

- changelog.md format. :)
- tox.ini cleanup
- refactoring tests to use examples directory instead of embedding example tests in test code.
- this is easier to understand and debug issues.
- also provides extra documentation through examples directory

Fixed

- Handle cases when context is None

Changed

- Update pyproject.toml to use newer flit
- Changed plugin name from pytest_check to pytest-check.

Added

- Add `raises`