Add ChatDev Python SDK release announcement

Added announcement for the ChatDev Python SDK release.

Author: ACE-Prism

README.md

@@ -25,8 +25,6 @@ ChatDev has evolved from a specialized software development multi-agent system i
 ## 🎉 News
 • **Jan 07, 2026: 🚀 We are excited to announce the official release of ChatDev 2.0 (DevAll)!** This version introduces a zero-code multi-agent orchestration platform. The classic ChatDev (v1.x) has been moved to the [`chatdev1.0`](https://github.com/OpenBMB/ChatDev/tree/chatdev1.0) branch for maintenance. More details about ChatDev 2.0 can be found on [our official post](https://x.com/OpenBMB/status/2008916790399701335).
 
-• **March 21, 2026: 🚀 We have released the ChatDev Python SDK (PyPI package `chatdev`)**, so you can run YAML workflow and multi-agent tasks directly in Python. For installation and version details, see [PyPI: chatdev 0.1.0](https://pypi.org/project/chatdev/0.1.0/).
-
 <details>
 <summary>Old News</summary>
 
@@ -261,6 +259,8 @@ if result.final_message:
     print(f"Output: {result.final_message.text_content()}")
 ```
 
+**We have released the ChatDev Python SDK (PyPI package `chatdev`)**, so you can also run YAML workflow and multi-agent tasks directly in Python. For installation and version details, see [PyPI: chatdev 0.1.0](https://pypi.org/project/chatdev/0.1.0/).
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