remove Cobertura as it does not work with JDK 11

Author: hboutemy

pom.xml

@@ -485,11 +485,6 @@ limitations under the License.
           <artifactId>maven-surefire-report-plugin</artifactId>
           <version>2.22.2</version>
         </plugin>
-        <plugin>
-          <groupId>org.codehaus.mojo</groupId>
-          <artifactId>cobertura-maven-plugin</artifactId>
-          <version>2.7</version>
-        </plugin>
         <plugin>
           <groupId>org.codehaus.mojo</groupId>
           <artifactId>findbugs-maven-plugin</artifactId>
@@ -656,10 +651,6 @@ limitations under the License.
               </reportSet>
             </reportSets>
           </plugin>
-          <plugin>
-            <groupId>org.codehaus.mojo</groupId>
-            <artifactId>cobertura-maven-plugin</artifactId>
-          </plugin>
         </plugins>
       </reporting>
     </profile>