Fix versions

pom.xml

@@ -34,9 +34,9 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <java.version>1.7</java.version>
 
-        <junit.version>4.12</junit.version>
         <junit.version>4.12</junit.version>
         <mockito.version>2.0.28-beta</mockito.version>
+        <cobertura.version>2.7</cobertura.version>
         <coveralls.version>3.1.0</coveralls.version>
     </properties>