Update phpunit.xml to display deprecations

Author: michalbundyra

phpunit.xml

@@ -1,7 +1,6 @@
 <phpunit
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="vendor/phpunit/phpunit/phpunit.xsd"
-         displayDetailsOnPhpunitDeprecations="true"
          displayDetailsOnTestsThatTriggerDeprecations="true"
          bootstrap="vendor/autoload.php">
     <testsuite name="Unit tests">