Update link references of ownership from nexB to aboutcode-org

Signed-off-by: Chin Yeung Li <[email protected]>

Merge pull request #35 from nexB/release-prep-v30.0.1

Release prep v30.0.1

Release v30.0.0

Release v21.6.1

Release v21.5.31

Release v21.2.24

Make mimetypes work on Windows

Work around Python 3.7+ bug and fix rdescription

Improve doc and CI, remove Python 2

Fix merge and doc issues