rhbz1036435 - Add comment with a liquibase upgrade notice.

pom.xml

@@ -322,11 +322,11 @@
             </bannedDependencies>
             <banDuplicateClasses>
               <findAllDuplicates>true</findAllDuplicates>
-              <message xml:space="preserve">
-Warning: found duplicate classes on classpath.  Please remove unnecessary
-dependencies if possible, and consider adding them to bannedDependencies.
-If that is not possible, please add an ignoreClass for the class or entire
-package.
+              <message xml:space="preserve">
+Warning: found duplicate classes on classpath.  Please remove unnecessary
+dependencies if possible, and consider adding them to bannedDependencies.
+If that is not possible, please add an ignoreClass for the class or entire
+package.
                        </message>
             </banDuplicateClasses>
             <requireNoRepositories>
@@ -982,6 +982,9 @@ package.
       </dependency>
 
       <!-- Liquibase Dependencies -->
+      <!-- If the Liquibase version is being updated, please refer to
+      any changelog files that run 'on change' and make sure that they still run
+      after upgrading the version. -->
       <dependency>
         <groupId>org.liquibase</groupId>
         <artifactId>liquibase-core</artifactId>