[docs] update rc version

Author: david-lev

README.md

@@ -28,18 +28,19 @@
 > ⚠️ **Pywa v3 Release Candidate Available!**  
 > Pywa `v3.0.0` is now available for testing!  
 >
-> 🚀 **What’s New in v3:**  
+> 🚀 **What’s New in v3:**
+
 > • Complete **template system redesign** – easier structure, validation, and sending  
 > • Full support for **calls** (incoming and outgoing)  
 > • Improved **security**, **typing**, and **input validation**
->
+
 > 📚 [v3 Documentation »](https://pywa.readthedocs.io/en/v3/)  
 > 🧭 [Migration Guide (2.x → 3.x) »](https://github.com/david-lev/pywa/blob/v3/MIGRATION.md)  
 > 📝 [Full Changelog »](https://github.com/david-lev/pywa/blob/v3/CHANGELOG.md)  
 >
 > 📦 **Install for testing:**  
 > ```bash
-> pip install pywa==3.0.0-rc.2
+> pip install pywa==3.0.0-rc.3
 > ```  
 >
 > 💬 Feedback and issue reports are encouraged to help us prepare for the stable release.