Correcting javadoc error with assert usage

git-svn-id: https://svn.apache.org/repos/asf/maven/shared/trunk@486389 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pom.xml b/pom.xml
index ecbc1d7..307708f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -46,6 +46,12 @@
         </configuration>
       </plugin>
       <plugin>
+        <artifactId>maven-javadoc-plugin</artifactId>
+        <configuration>
+          <source>1.4</source>
+        </configuration>
+      </plugin>
+      <plugin>
         <groupId>org.codehaus.plexus</groupId>
         <artifactId>plexus-maven-plugin</artifactId>
         <executions>
@@ -66,4 +72,4 @@
       <version>2.0.4</version>
     </dependency>
   </dependencies>
-</project>
\ No newline at end of file
+</project>