Update maven-jar-plugin

Author: eucyt

generator/pom.xml

@@ -49,11 +49,10 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-jar-plugin</artifactId>
-                <version>2.6</version>
+                <version>3.4.2</version>
                 <executions>
                     <execution>
                         <goals>
-                            <goal>jar</goal>
                             <goal>test-jar</goal>
                         </goals>
                     </execution>