docs: fix the badges issue in README (#413)

Author: caitaozhan

README.md

@@ -14,11 +14,12 @@
 [![PyPi](https://img.shields.io/pypi/v/sequence)](https://pypi.org/project/sequence/)
 ![pyversions](https://img.shields.io/pypi/pyversions/sequence)
 [![CI Pipeline](https://github.com/sequence-toolbox/SeQUeNCe/actions/workflows/ci.yml/badge.svg)](https://github.com/sequence-toolbox/SeQUeNCe/actions/workflows/ci.yml)
-[![Documentation](https://img.shields.io/readthedocs/sequence-rtd-tutorial)](https://sequence-rtd-tutorial.readthedocs.io/)
+[![Documentation](https://readthedocs.org/projects/sequence-rtd-tutorial/badge/?version=stable)](https://sequence-rtd-tutorial.readthedocs.io/)
 [![QuTiP](https://img.shields.io/badge/integration-QuTiP-blue)](https://qutip.org/)
 [![Stim](https://img.shields.io/badge/integration-Stim-blue)](https://github.com/quantumlib/Stim)
 [![Paper](https://img.shields.io/badge/10.1088%2F2058-9565%2Fac22f6?label=DOI)](https://iopscience.iop.org/article/10.1088/2058-9565/ac22f6)
-[![Download-month](https://img.shields.io/pypi/dm/sequence)](https://pypistats.org/packages/sequence)
+[![Downloads](https://static.pepy.tech/badge/sequence/month)](https://pepy.tech/project/sequence)
+
 
 </div>