Replace get_class() calls by ::class

Author: deguif

Tests/FormTest.php

@@ -207,7 +207,7 @@ public function testConstructor($message, $form, $values)
             $values,
             array_map(
                 function ($field) {
-                    $class = \get_class($field);
+                    $class = $field::class;
 
                     return [substr($class, strrpos($class, '\\') + 1), $field->getValue()];
                 },