update phpunit configuration

Author: sidz

phpunit.xml.dist

@@ -6,17 +6,15 @@
          executionOrder="random"
          verbose="true"
 >
+    <coverage>
+        <include>
+            <directory>src</directory>
+        </include>
+    </coverage>
 
     <testsuites>
         <testsuite name="Main Test Suite">
             <directory>tests/phpunit</directory>
         </testsuite>
     </testsuites>
-
-    <filter>
-        <whitelist>
-            <directory>src</directory>
-        </whitelist>
-    </filter>
-
 </phpunit>