v7.20.0

Feature

• Rewrite Twine adapter for uploading to artifact repositories (cfb20af)
• Allow custom environment variable names (#392) (372cda3)
• repository: Add to settings artifact repository (f4ef373)

Fix

• Mypy errors in vcs_helpers (13ca0fe)
• Skip removing the build folder if it doesn't exist (8e79fdc)
• Don't use linux commands on windows (#393) (5bcccd2)

Documentation

• Clean typos and add section for repository upload (1efa18a)