release: allow for branch protection in release steps

Since the introduction of the branch protection rule to stop users
pushing directly to `main` the previous release steps started failing.
This changes the instructions to require the user merges the changelog
update before tagging the release.

Signed-off-by: crozzy <joseph.crosland@gmail.com>

Author: crozzy

.github/scripts/prepare-release

@@ -38,6 +38,7 @@ gh run watch "${id}"
 cat <<.
 Now, to merge and release:
 
+	go to github and approve the PR titled "${VERSION} Changelog Bump" and wait for it to be merged.
 	git checkout ${BRANCH}
 	git fetch ${REMOTE}
 	git merge --ff-only ${REMOTE}/ready-${VERSION}