Enhancement: Reference configuration schema

Author: localheinz

phpunit.xml.dist

@@ -1,6 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
-<phpunit backupGlobals="false"
+<phpunit
+ xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+ xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/4.8/phpunit.xsd"
+ backupGlobals="false"
  backupStaticAttributes="false"
  colors="true"
  convertErrorsToExceptions="true"