doc: update zb version tag (FloatTech#1206)

Author: Kajiekazz

README.md

@@ -20,7 +20,7 @@
 
   [![go](https://goreportcard.com/badge/github.com/FloatTech/ZeroBot-Plugin?style=flat-square&logo=go)](https://goreportcard.com/badge/github.com/FloatTech/ZeroBot-Plugin)
   [![onebot](https://img.shields.io/badge/onebot-v11-black?style=flat-square&logo=data:image/png;base64,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)](https://t.me/zerobotplugin)
-  [![zerobot](https://img.shields.io/badge/zerobot-v1.8.0-black?style=flat-square&logo=go)](https://github.com/wdvxdr1123/ZeroBot)
+  [![zerobot](https://img.shields.io/badge/zerobot-v1.8.1-black?style=flat-square&logo=go)](https://github.com/wdvxdr1123/ZeroBot)