Switch coverage plugin from cobertura to Jacoco

There is a know bug in cobertura with Java 9
See cobertura/cobertura#271

Update badge in README file

Update pom for jacoco plugin

.travis.yml

@@ -4,8 +4,6 @@
 # This enables the 'defaults' to test java applications:
 language: java
 
-script: "mvn cobertura:cobertura"
-
 # We can specify a list of JDKs to be used for testing
 # A list of available JDKs in Trusty can be seed in:
 # https://docs.travis-ci.com/user/reference/trusty/#jvm-clojure-groovy-java-scala-images

README.md

@@ -1,5 +1,5 @@
 [![Build Status](https://api.travis-ci.com/gkoudjou/primesum.svg?branch=master)](https://api.travis-ci.com/gkoudjou/primesum.svg?branch=master)
-[![Code Coverage](https://codecov.io/github/gkoudjou/primesum/coverage.svg)](https://codecov.io/github/gkoudjou/primesum/coverage.svg)
+[![codecov](https://codecov.io/gh/gkoudjou/primesum/branch/master/graph/badge.svg)](https://codecov.io/gh/gkoudjou/primesum)
 
 # PrimeSum
 Approach to solving the problem of the sum of the first N primes. Using stream.

pom.xml

@@ -74,18 +74,6 @@
           <artifactId>maven-project-info-reports-plugin</artifactId>
           <version>3.0.0</version>
         </plugin>
-        <plugin>
-          <groupId>org.codehaus.mojo</groupId>
-          <artifactId>cobertura-maven-plugin</artifactId>
-          <version>2.7</version>
-          <configuration>
-            <formats>
-              <format>html</format>
-              <format>xml</format>
-            </formats>
-            <check />
-          </configuration>
-        </plugin>
       </plugins>
     </pluginManagement>
     <plugins>
@@ -97,6 +85,25 @@
           <target>8</target>
         </configuration>
       </plugin>
+      <plugin>
+        <groupId>org.jacoco</groupId>
+        <artifactId>jacoco-maven-plugin</artifactId>
+        <version>0.8.2</version>
+        <executions>
+          <execution>
+            <goals>
+              <goal>prepare-agent</goal>
+            </goals>
+          </execution>
+          <execution>
+            <id>report</id>
+            <phase>test</phase>
+            <goals>
+              <goal>report</goal>
+            </goals>
+          </execution>
+        </executions>
+      </plugin>
     </plugins>
   </build>
 </project>