Correct the version of Wicket (6.12.0)

wicket/README.md

@@ -15,7 +15,7 @@ Use [Hibernate](http://www.hibernate.org/) for interaction with MySQL database.
 ## Versions
 
 * [Java OpenJDK 1.7.0_09](http://openjdk.java.net/)
-* [Wicket 6.5.0](http://wicket.apache.org/)
+* [Wicket 6.12.0](http://wicket.apache.org/)
 * [Hibernate 4.1.1](http://www.hibernate.org/)
 * [MySQL 5.5.29](http://dev.mysql.com/)
 * [Maven 2.2.1](https://maven.apache.org/)
@@ -29,4 +29,4 @@ Use [Hibernate](http://www.hibernate.org/) for interaction with MySQL database.
 
 ### Database Mapping Test
 
-    http://localhost:8080/wicket/hello_db?queries=5
+    http://localhost:8080/wicket/hello_db?queries=5