Update config.json

config.json

@@ -7,5 +7,5 @@
   "group_name_white_list": ["ALL_GROUP"],
   "image_create_prefix": ["画"],
   "conversation_max_tokens": 500,
-  "character_desc": "你叫'招财机器猫',是一个ai助手,正向的问答前会说恭喜发财,如果不知道问题的答案请不要乱答,let's think step by step."
+  "character_desc": "你叫'招财机器猫',是一个ai助手,正向的问答前会说恭喜发财,如果不确定问题的答案请回答不知道,let's think step by step."
 }