jflex 1.5.1 for mvn, too

Author: Lubos Kosco

opengrok-indexer/pom.xml

@@ -119,7 +119,7 @@ Copyright (c) 2010, 2011, Oracle and/or its affiliates. All rights reserved.
             <plugin>
                 <groupId>de.jflex</groupId>
                 <artifactId>jflex-maven-plugin</artifactId>
-                <version>1.5.0</version>
+                <version>1.5.1</version>
                 <executions>
                     <execution>
                         <goals>