Heroku + Gradle is now supported

Author: Ackerman, Trevor

heroku.html

@@ -18,7 +18,7 @@ <h2>Limitations</h2>
 <ul>
     <li>You can only use it with a Postgresql database, as this is what Heroku provides by default</li>
     <li>You can only use it with the Grunt option (which is the recommended default), as it's the only one providing tasks for deploying</li>
-    <li>You can only use it with the Maven option (which is the recommended default), as it's the only one supported by Heroku</li>
+    <li>You can use it with either Maven or Gradle</li>
     <li>If your applicaiton is killed by Heroku when your Liquibase changelog is being applied, your database will be marked as "locked" by Liquibase. You will need to manually clean the lock table</li>
 </ul>
 </p>