chore: update workflow link in README (#218)

README.md

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 # uAgents: AI Agent Framework
-[![Official Website](https://img.shields.io/badge/Official%20Website-fetch.ai-blue?style=flat&logo=world&logoColor=white)](https://fetch.ai) [![Unit Tests](https://img.shields.io/github/actions/workflow/status/Fetchai/uAgents/ci.yml?label=unit%20tests)](https:/Fetchai/uAgents/actions/workflows/ci.yml) [![GitHub Repo stars](https://img.shields.io/github/stars/Fetchai/uAgents?style=social)](https:/Fetchai/uAgents/stargazers) [![Twitter Follow](https://img.shields.io/twitter/follow/fetch_ai?style=social)](https://twitter.com/fetch_ai)
+[![Official Website](https://img.shields.io/badge/Official%20Website-fetch.ai-blue?style=flat&logo=world&logoColor=white)](https://fetch.ai) [![Unit Tests](https://img.shields.io/github/actions/workflow/status/Fetchai/uAgents/ci-tests.yml?label=unit%20tests)](https:/Fetchai/uAgents/actions/workflows/ci-tests.yml) [![GitHub Repo stars](https://img.shields.io/github/stars/Fetchai/uAgents?style=social)](https:/Fetchai/uAgents/stargazers) [![Twitter Follow](https://img.shields.io/twitter/follow/fetch_ai?style=social)](https://twitter.com/fetch_ai)
 
 uAgents is a library developed by Fetch.ai that allows for creating autonomous AI agents in Python. With simple and expressive decorators, you can have an agent that performs various tasks on a schedule or takes action on various events.