Abstract factory (#366)

* rewrite of the Abstract Factory pattern

* update composer deps

* fixed argument to json_encode which cannot be null

Creational/AbstractFactory/WinJsonWriter.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace DesignPatterns\Creational\AbstractFactory;
+
+class WinJsonWriter implements JsonWriter
+{
+    public function write(array $data, bool $formatted): string
+    {
+
+
+        return json_encode($data, JSON_PRETTY_PRINT);
+    }
+}