Change UTF8 to utf8mb4 for MySQL example (#10)

Due to bug in MySQL/MariaDB, utf8mb4 needs to be used for proper UTF-8 encoding.

Author: n0nag0n

app/config/database.php

@@ -39,7 +39,7 @@
 			'reconnect'   => false,
 			'queries'     =>
 			[
-				'SET NAMES UTF8',
+				'SET NAMES utf8mb4',
 			],
 		],