Update README.md

Author: neuecc

README.md

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 > [!IMPORTANT]
-> I have started distributing an evolved version of UniRx in [Cysharp/R3](https://github.com/Cysharp/R3)(This is a temporary name and may be changed to UniRx). It's still in preview, but eventually, UniRx will be archived. Since R3 has some incompatible parts, for continuous use, please fork UniRx or try R3.
+> I have started distributing an evolved version of UniRx in [Cysharp/R3](https://github.com/Cysharp/R3), please use it instead of UniRx.
 
 UniRx - Reactive Extensions for Unity
 ===
 Created by Yoshifumi Kawai(neuecc)
 
-[![CircleCI](https://circleci.com/gh/neuecc/UniRx.svg?style=svg)](https://circleci.com/gh/neuecc/UniRx)  
-[![Become as Backer](https://opencollective.com/unirx/tiers/backer.svg?avatarHeight=50)](https://opencollective.com/unirx) [![Become as Sponsor](https://opencollective.com/unirx/tiers/sponsor.svg?avatarHeight=50)](https://opencollective.com/unirx)
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 What is UniRx?
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 UniRx (Reactive Extensions for Unity) is a reimplementation of the .NET Reactive Extensions. The Official Rx implementation is great but doesn't work on Unity and has issues with iOS IL2CPP compatibility. This library fixes those issues and adds some specific utilities for Unity. Supported platforms are PC/Mac/Android/iOS/WebGL/WindowsStore/etc and the library.
@@ -1239,8 +1236,6 @@ Help & Contribute
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 Support thread on the Unity forum. Ask me any question - [http://forum.unity3d.com/threads/248535-UniRx-Reactive-Extensions-for-Unity](http://forum.unity3d.com/threads/248535-UniRx-Reactive-Extensions-for-Unity)  
 
-Become a backer, Sponsored, one time donation are welcome, we're using [Open Collective - UniRx](https://opencollective.com/unirx/#)
-
 We welcome any contributions, be they bug reports, requests or pull request.  
 Please consult and submit your reports or requests on GitHub issues.  
 Source code is available in `Assets/Plugins/UniRx/Scripts`.