build: add commons-demo dependency

Author: ngonzalezpazFC

pom.xml

@@ -115,6 +115,12 @@
 		    <version>4.13.1</version>
 		    <scope>test</scope>
 		</dependency>
+		<dependency>
+			<groupId>com.flowingcode.vaadin.addons.demo</groupId>
+			<artifactId>commons-demo</artifactId>
+			<version>1.0.0-SNAPSHOT</version>
+			<scope>test</scope>
+		</dependency>
     </dependencies>
 
     <build>