Remove chmod as it's giving warnings

Also it's better to let the user control it them selves using
`umask()`, removing the chmod will also make it compatible
with windows.

Author: MarijnKoesen

src/Generator/AbstractTypeGenerator.php

@@ -365,7 +365,6 @@ public function generateClass(array $config, $outputDirectory, $mode = false)
                 }
                 if (($mode & self::MODE_OVERRIDE) || !file_exists($path)) {
                     file_put_contents($path, $code);
-                    chmod($path, 0664);
                 }
             }
         }