Update README.md

Author: secondl1ght

README.md

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 **Encrypted messaging over the bitcoin lightning network.**
 
-![image](https://cipherchat.app/agplv3.png)
+![image](https://github.com/secondl1ght/cipherchat/assets/85003930/dc7ebeb4-9e84-4aa5-8f86-b0d7687c2b17)
 
 [[email protected]](mailto:[email protected])