update: add register ip limit

app/Http/Controllers/Admin/ConfigController.php

@@ -104,7 +104,7 @@ class ConfigController extends Controller
                 'tos_url' => config('v2board.tos_url'),
                 'currency' => config('v2board.currency', 'CNY'),
                 'currency_symbol' => config('v2board.currency_symbol', '¥'),
-                'register_limit_by_ip_enable' => config('v2board.register_limit_by_ip_enable', 0),
+                'register_limit_by_ip_enable' => (int)config('v2board.register_limit_by_ip_enable', 0),
                 'register_limit_count' => config('v2board.register_limit_count', 3),
                 'register_limit_expire' => config('v2board.register_limit_expire', 60)
             ],