完善console 增加output一些常用的方法

library/think/console/output/question/Choice.php

@@ -9,7 +9,9 @@
 // | Author: yunwuxin <448901948@qq.com>
 // +----------------------------------------------------------------------
 
-namespace think\console\helper\question;
+namespace think\console\output\question;
+
+use think\console\output\Question;
 
 class Choice extends Question
 {
@@ -56,6 +58,11 @@ class Choice extends Question
         return $this;
     }
 
+    public function isMultiselect()
+    {
+        return $this->multiselect;
+    }
+
     /**
      * 获取提示
      * @return string