Update README.md

强迫症

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 [![Travis](https://img.shields.io/travis/24OI/OI-wiki.svg?style=flat-square)](https://travis-ci.org/24OI/OI-wiki)
 [![Progress](https://img.shields.io/badge/Progress-66%25-brightgreen.svg?style=flat-square)](https://github.com/24OI/OI-wiki)
 [![Telegram](https://img.shields.io/badge/OI--wiki-join%20Telegram%20chat-brightgreen.svg?style=flat-square)](https://t.me/OIwiki)
-[![Discord](https://img.shields.io/badge/oi--wiki-join%20Discord%20group-brightgreen.svg?style=flat-square)](https://discord.gg/xXdYSMq)
+[![Discord](https://img.shields.io/badge/OI--wiki-join%20Discord%20group-brightgreen.svg?style=flat-square)](https://discord.gg/xXdYSMq)
 [![QQ](https://img.shields.io/badge/OI--wiki-join%20QQ%20group-brightgreen.svg?style=flat-square)](https://jq.qq.com/?_wv=1027&k=5EfkM6K)
 [![GitHub watchers](https://img.shields.io/github/watchers/24OI/OI-Wiki.svg?style=social&label=Watch)](https://github.com/24OI/OI-wiki)
 [![GitHub stars](https://img.shields.io/github/stars/24OI/OI-Wiki.svg?style=social&label=Stars)](https://github.com/24OI/OI-wiki)