Update README.md

Author: HzaCode

README.md

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 [![PyPI version](https://img.shields.io/pypi/v/ChemInformant.svg)](https://pypi.org/project/ChemInformant/)
 [![Python Version](https://img.shields.io/badge/python-%3E%3D3.8-blue.svg)](https://pypi.org/project/ChemInformant/)
 [![Build Status](https://img.shields.io/github/actions/workflow/status/HzaCode/ChemInformant/tests.yml?label=Build)](https://github.com/HzaCode/ChemInformant/actions/workflows/tests.yml) 
-[![codecov](https://codecov.io/gh/HzaCode/ChemInformant/graph/badge.svg)](https://codecov.io/gh/HzaCode/ChemInformant)
+![coverage](https://raw.githubusercontent.com/HzaCode/ChemInformant/gh-pages/coverage.svg)
 [![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
 [![PyPI - License](https://img.shields.io/pypi/l/ChemInformant.svg)](https://github.com/HzaCode/ChemInformant/blob/main/LICENSE.md)
 [![Docs](https://img.shields.io/badge/Docs-Read_Online-blue?style=flat-square&logo=book&logoColor=white)](https://hezhiang.com/ChemInformant)
 
 
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 **ChemInformant** is a robust data acquisition engine for the [PubChem](https.ncbi.nlm.nih.gov/pccompound/) database, engineered for the modern scientific workflow. It intelligently manages network requests, performs rigorous runtime data validation, and delivers analysis-ready results, providing a dependable foundation for any computational chemistry project in Python.
 
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