Update README.md

Lizz-2023 · May 19, 2021 · e9165f3 · e9165f3
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 * Some authorizations by authors can be found [here](https://github.com/bmatthiesen/IRS-continuous/issues/1) and [here](https://github.com/emilbjornson/IRS-relaying/issues/1).
 
-* We also have WeChat group for RIS(IRS). If you want to join, please send your WeChat ID to kewang0225@gmail.com. In the email, please state your real NAME and UNIVERSITY(it's a must for some reasons). 
+* We also have WeChat group for RIS(IRS). If you want to join, please send your WeChat ID to kewang0225@gmail.com. In the email, please state your real NAME and UNIVERSITY (it's a must for some reasons). 
 
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