Merge branch 'jc/relnotes-v0-extension-update' into master

Last minute fix-up to the release notes. * jc/relnotes-v0-extension-update: RelNotes: update the v0 with extension situation

Junio C Hamano committed Jul 18, 2020 at 16:35 UTC d400cb0d1ba45c8f17b132b50b7685614af8505c

No changes.