php7.2 compatibility

Author: wol-soft

src/Model/Schema.php

@@ -150,7 +150,7 @@ public function getUsedClasses(): array
         $usedClasses = $this->usedClasses;
 
         foreach ($this->namespaceTransferDecorators as $decorator) {
-            array_push($usedClasses, ...$decorator->resolve());
+            $usedClasses = array_merge($usedClasses, $decorator->resolve());
         }
 
         return $usedClasses;

src/PropertyProcessor/Decorator/SchemaNamespaceTransferDecorator.php

@@ -40,7 +40,7 @@ public function resolve(): array
 
         if ($this->fetchPropertyImports) {
             foreach ($this->schema->getProperties() as $property) {
-                array_push($usedClasses, ...$this->getUsedClasses($property));
+                $usedClasses = array_merge($usedClasses, $this->getUsedClasses($property));
             }
         }