Update README.md

README.md

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-  💻 <a href="https://github.com/FlagAI-Open/Aquila2" target="_blank">Github</a> • 🐦 <a href="https://twitter.com/BAAIBeijing" target="_blank">Twitter</a> <br>
+  <a href="https://github.com/FlagAI-Open/Aquila2" target="_blank">Github</a> • <a href="https://github.com/FlagAI-Open/Aquila2/blob/main/assets/wechat-qrcode.jpg" target="_blank">WeChat</a> <br>
 </p>
 
-<p align="center">
-    👋 Join our <a href="https://github.com/FlagAI-Open/Aquila2/blob/main/assets/wechat-qrcode.jpg" target="_blank">WeChat</a>
-</p>
 
 
 We opensource our **Aquila2** series, now including **Aquila2**, the base language models, namely **Aquila2-7B** and **Aquila2-34B**, as well as **AquilaChat2**, the chat models, namely **AquilaChat2-7B** and **AquilaChat2-34B**, as well as the long-text chat models, namely **AquilaChat2-7B-16k** and **AquilaChat2-34B-16k**