Code 4: pom.xml - Scala Maven plugin

 <plugin>
     <groupId>net.alchim31.maven</groupId>
     <artifactId>scala-maven-plugin</artifactId>
     <configuration>
       <args>
         <arg>-deprecation</arg>
         <arg>-feature</arg>
       </args>
     </configuration>
     <executions>
       <execution>
         <goals>
           <goal>compile</goal>
           <goal>testCompile</goal>
         </goals>
       </execution>
     </executions>
  </plugin>