Preparing a release

1. Bump version number in main.go (format: x.x.x), and in README.md and deploy/autoneg.yaml (format: vx.x.x).
2. If there are changes in the generated manifests, run VERSION=vx.x.x make autoneg-manifests, and replace the Google header in deploy/autoneg.yaml
3. Commit locally
4. Create local release tag (git tag vx.x.x -m "Version vx.x.x")
5. Push release tag (git push origin vx.x.x) which will build and push a release image
6. Make github release, with version vx.x.x pointing to the pushed tag (vx.x.x)
7. Bump version in main.go to x.x.(x+1)-dev
8. Commit to master