Update reference-demo-content.version to 1.9.0 (#1039)

Author: wikumChamith

distro/pom.xml

@@ -58,7 +58,7 @@
     <tasks.version>2.1.0</tasks.version>
     <!-- Content Packages -->
     <reference-content.version>1.4.0</reference-content.version>
-    <reference-demo-content.version>1.8.0</reference-demo-content.version>
+    <reference-demo-content.version>1.9.0</reference-demo-content.version>
   </properties>
 
   <dependencies>