Buf v0.7.0 is released - allow git tags in addition to git branches

[bufbuild-announce]

We have released Buf v0.7.0.

This is a simple release: before v0.7.0, you could only specify the branch of a git input:

$ buf check lint --input .git#branch=master

$ buf check lint --input https://github.com/foo/bar.git#branch=master

Now, tags can be used as well:

$ buf check lint --input .git#tag=v1.0.0

$ buf check lint --input https://github.com/foo/bar.git#tag=v1.0.0

The brew tap and documentation have also been updated.