Remove Cobertura to be compatible with Java 11

Change-Id: I2d9d30438eaff5ddeb6ca8000435579f3233e61d
diff --git a/pom.xml b/pom.xml
index f15b34c..2a08995 100644
--- a/pom.xml
+++ b/pom.xml
@@ -4,7 +4,7 @@
   <groupId>de.ids_mannheim.korap</groupId>
   <artifactId>KalamarExportPlugin</artifactId>
   <packaging>jar</packaging>
-  <version>0.2.8</version>
+  <version>0.2.9</version>
   <name>KalamarExportPlugin</name>
   <url>https://korap.ids-mannheim.de/</url>
   
@@ -98,14 +98,6 @@
       <version>2.3.31</version>
     </dependency>
 
-    <!-- https://mvnrepository.com/artifact/org.codehaus.mojo/cobertura-maven-plugin -->
-    <dependency>
-      <groupId>org.codehaus.mojo</groupId>
-      <artifactId>cobertura-maven-plugin</artifactId>
-      <version>2.7</version>
-      <scope>test</scope>
-    </dependency>
-
     <!-- https://mvnrepository.com/artifact/org.glassfish.jersey.media/jersey-media-sse -->
     <dependency>
       <groupId>org.glassfish.jersey.media</groupId>
@@ -130,6 +122,19 @@
       <artifactId>tinylog-api</artifactId>
       <version>2.5.0</version>
     </dependency>
+    <dependency>
+      <groupId>ch.qos.logback</groupId>
+      <artifactId>logback-classic</artifactId>
+      <version>1.3.0</version>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.slf4j</groupId>
+      <artifactId>slf4j-api</artifactId>
+      <version>2.0.5</version>
+    </dependency>
+
+
 
     <!-- API, java.xml.bind module -->
     <dependency>
@@ -219,25 +224,6 @@
         </executions>
       </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></check>
-        </configuration>
-        <executions>
-          <execution>
-            <goals>
-              <goal>clean</goal>
-            </goals>
-          </execution>
-        </executions>
-      </plugin>
-      <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-surefire-plugin</artifactId>
         <version>3.0.0-M5</version>