Improve MAVEN build Performance

.travis.yml

@@ -2,4 +2,4 @@ language: java
 jdk:
     - openjdk11
 after_success:
-  - mvn clean cobertura:cobertura coveralls:report
+  - mvn -T 1C clean cobertura:cobertura coveralls:report

pom.xml

@@ -77,6 +77,11 @@
                 <plugin>
                     <artifactId>maven-surefire-plugin</artifactId>
                     <version>2.22.1</version>
+                    <configuration>
+                    	<parallel>classes</parallel>
+                    	<useUnlimitedThreads>true</useUnlimitedThreads>
+                    </configuration>
+
                 </plugin>
 
                 <plugin>