How to release v1

1. Determine the current release version with git tag -l. It should look something like vX.Y.Z. We'll call the current version $CV and the new version $NV.
2. On master, run git log $CV.. to list all the changes since the last release. a. NOTE: Some commits may pertain to only v1 or v2. Manually introspect each commit to figure which occurred in v1.
3. Edit CHANGES.md to include a summary of the changes.
4. Mail the CL containing the CHANGES.md changes. When the CL is approved, submit it.
5. Without submitting any other CLs: a. Switch to master. b. git pull c. Tag the repo with the next version: git tag $NV. It should be of the form v1.Y.Z. d. Push the tag: git push origin $NV.
6. Update the releases page with the new release, copying the contents of the CHANGES.md.

How to release v2

Same process as v1, once again noting that the commit list may include v1 commits (which should be pruned out). Note also whilst v1 tags are v1.Y.Z, v2 tags are v2.Y.Z.

On releasing multiple major versions

Please see https://github.com/golang/go/wiki/Modules#releasing-modules-v2-or-higher.