bin/gempush-if-changed in phonetics-2.0.1 vs bin/gempush-if-changed in phonetics-3.0.1

@@ -1,8 +1,15 @@
 #!/bin/bash
 
 set -x
-if git diff --name-only HEAD..HEAD^ | egrep -q '^VERSION$'; then
-  # The VERSION file changed in the last commit, build the gem and push
+
+# 'latest' is a git tag that we recreate every time we release a new
+# version. If the VERSION file has changed since `latest` then we release a
+# new version.
+git pull --tags
+if git diff --name-only HEAD latest -- VERSION | egrep -q .; then
+  # The VERSION file changed since 'latest', build the gem and push
   gem build *.gemspec
   gem push *.gem
+  git tag -f latest HEAD
+  git push origin latest
 fi