Update README.md

Author: hhftechnology

README.md

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     <h1 align="center"><a href="https://github.com/hhftechnology/middleware-manager-traefik">Traefik/Pangolin Middleware Manager</a></h1>
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+[![Docker](https://img.shields.io/docker/pulls/hhftechnology/middleware-manager?style=flat-square)](https://hub.docker.com/r/hhftechnology/middleware-manager)
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 <h3 align="center">Comprehensive Middleware, Router, and Service Management for Traefik</h3>
 
 <div align="center">