Change tags commit messages

Adapt the tags commit messages to the release system implemented by
GitHub.

Change-Id: I859f59c9b39fce07bd48cc836194264b6e21ee56
diff --git a/tagRelease.bash b/tagRelease.bash
index bc269ca..06d00e8 100644
--- a/tagRelease.bash
+++ b/tagRelease.bash
@@ -46,7 +46,8 @@
   exit
 fi
 
-commitMessage="Changelog: $GITILES_REPO_URL/+log/refs/tags/$prevVersion..refs/tags/$nextVersion"
-git tag -a $nextVersion -m "$commitMessage"
+commitMessage1="$nextVersion"
+commitMessage2="Changelog: $GITILES_REPO_URL/+log/refs/tags/$prevVersion..refs/tags/$nextVersion"
+git tag -a $nextVersion -m "$commitMessage1" -m "$commitMessage2"
 
 echo "Tag created. Now run \`git push --tags\` to push the tags to the server."