introduce versions-maven-plugin

Author: nkzawa

pom.xml

@@ -209,6 +209,11 @@
           </execution>
         </executions>
       </plugin>
+      <plugin>
+        <groupId>org.codehaus.mojo</groupId>
+        <artifactId>versions-maven-plugin</artifactId>
+        <version>2.2</version>
+      </plugin>
       <plugin>
         <groupId>com.github.github</groupId>
         <artifactId>site-maven-plugin</artifactId>