修复命令行新建插件的错误

@@ -8,6 +8,7 @@ use think\console\Command;
 use think\console\Input;
 use think\console\Input;
 use think\console\input\Option;
 use think\console\input\Option;
 use think\console\Output;
 use think\console\Output;
+use think\Db;
 use think\Exception;
 use think\Exception;
 
 
 class Addon extends Command
 class Addon extends Command