Our fourth anniversary release contains the following changes:
- Use human-readable problem properties (breaking change)
- Check v is/isn't None for hess and sphess
- Add types to problem method docstrings
- Add guidelines for contributors
- Simplify CUTEst installation
- Add CUTEst docker install option
- Improve documentation
Note that the API for [find_problems()](https://jfowkes.github.io/pycutest/_build/html/functions/pycutest.find_problems.html) and properties returned by [problem_properties()](https://jfowkes.github.io/pycutest/_build/html/functions/pycutest.problem_properties.html) have changed in this release.