Merge pull request #900 from mrapp-ke/merge-bugfix

Merge bugfix into feature branch

Set minimum Python version to 3.8.

Do not force updating pip and setuptools as it may cause problems whe…

…n building packages for older Python versions.

Fix Clang compilation error.

Edit release date.

Edit changelog.

Edit release date.

Update version to 0.6.2.

Fix Sphinx warning.

Change release date.