Add sonar scanner plugin to POM file

Fixes #62

Author: goneall

pom.xml

@@ -301,6 +301,11 @@
         <groupId>org.owasp</groupId>
         <artifactId>dependency-check-maven</artifactId>
         <version>${dependency-check-maven.version}</version>
+      </plugin>
+      <plugin>
+        <groupId>org.sonarsource.scanner.maven</groupId>
+        <artifactId>sonar-maven-plugin</artifactId>
+        <version>5.3.0.6276</version>
       </plugin>
 	</plugins>
   </build>