Fix formatting in README news section

Author: ACE-Prism

README.md

@@ -25,7 +25,7 @@ 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/).
+• **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/).
 
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 <summary>Old News</summary>