In conformance to the inclusive naming initiatives of various organizations (including LF/CNCF, GH), master should be renamed to main. Note that it's been safe to do this for a while now given that GitHub handles the necessary redirects. For details, see:

• github/renaming
• Links to deleted branches now redirect to the default branch

Examples of repos across LF/CNCF that have renamed their default branches include: grpc.io and grpc-community.

cc @celestehorgan @nate-double-u