Added maven-plugin-plugin explicitly

Author: valgog

.travis.yml

@@ -15,4 +15,4 @@ install: true
 script: mvn -B -V package javadoc:javadoc test
 
 after_success:
-    - mvn clean test jacoco:report coveralls:report
+    - mvn -B -V clean test jacoco:report coveralls:report

pom.xml

@@ -82,10 +82,15 @@
                 <artifactId>maven-resources-plugin</artifactId>
                 <version>3.0.1</version>
             </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-plugin-plugin</artifactId>
+                <version>3.4</version>
+            </plugin>
             <plugin>
                 <groupId>org.eluder.coveralls</groupId>
                 <artifactId>coveralls-maven-plugin</artifactId>
-                <version>3.0.1</version>
+                <version>4.2.0</version>
             </plugin>
             <plugin>
                 <groupId>org.jacoco</groupId>