update phpunit config

Author: sivaram7

tests/unit/phpunit.xml.dist

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/6.1/phpunit.xsd"
+         xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/10.4/phpunit.xsd"
          colors="true"
          columns="max"
          bootstrap="../../bootstrap.php"
@@ -20,6 +20,11 @@
             </exclude>
         </whitelist>
     </filter>
+    <source>
+        <include>
+            <directory>../../src</directory>
+        </include>
+    </source>
 
     <php>
         <ini name="date.timezone" value="UTC"/>