Replace the 'VERSION = ' in Makefile.rule with the one from pyproject.toml

[mattip]

• I updated the package version in pyproject.toml and made sure the first 3 numbers match ./openblas_commit.txt. If I did not update ./openblas_commit.txt, I incremented the wheel build number (i.e. 0.3.29.0.0 to 0.3.29.0.1)

Note: update ./openblas_commit.txt with cd OpenBLAS; git describe --tags --abbrev=8 > ../openblas_commit.txt

Set the VERSION. This will make $ python -m threadpoolctl -i numpy and $ python -m scipy_openblas64 show the package version instead of a generic OpenBLAS version.

[mattip]

Closes #263

[mattip]

Also add a CHANGELOG.md that maps the package version to the git commit, and allows figuring out what changed.