fix: Remove YetAnotherXmppClient (#50)

Seems like https://github.com/jfechn/YetAnotherXmppClient was removed

README.md

@@ -69,7 +69,6 @@ Contributions are always welcome! Please take a look at the [contribution guidel
 - [WalletWasabi](https://github.com/zkSNACKs/WalletWasabi) - Open-source, non-custodial, privacy focused Bitcoin wallet for Windows, Linux, and Mac. Built-in Tor, CoinJoin, and coin control features.
 - [xDelta3 Cross GUI](https://github.com/dan0v/xdelta3-cross-gui) - A cross-platform GUI for creating patches using xDelta3 on Windows, Linux, and Mac.
 - [XmlyDownloader](https://github.com/zxyao145/XmlyDownloader) - Free audio downloader for ximalaya.com based on Avalonia
-- [YetAnotherXmppClient](https://github.com/jfechn/YetAnotherXmppClient) - XMPP library with Avalonia UI.
 - [Purple Explorer](https://github.com/telstrapurple/PurpleExplorer) - A cross-platform desktop application to manage messages in Azure service bus and queue
 
 ## Tutorials