update codecov budge

Author: huangshiyu13

README.md

@@ -11,7 +11,7 @@
 [![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
 
 [![Hits-of-Code](https://hitsofcode.com/github/OpenRL-Lab/openrl?branch=main)](https://hitsofcode.com/github/OpenRL-Lab/openrl/view?branch=main)
-[![codecov](https://codecov.io/gh/OpenRL-Lab/openrl_release/branch/main/graph/badge.svg?token=4FMEYMR83U)](https://codecov.io/gh/OpenRL-Lab/openrl_release)
+[![codecov](https://codecov.io/gh/OpenRL-Lab/openrl/graph/badge.svg?token=T6BqaTiT0l)](https://codecov.io/gh/OpenRL-Lab/openrl)
 
 [![Documentation Status](https://readthedocs.org/projects/openrl-docs/badge/?version=latest)](https://openrl-docs.readthedocs.io/en/latest/?badge=latest)
 [![Read the Docs](https://img.shields.io/readthedocs/openrl-docs-zh?label=%E4%B8%AD%E6%96%87%E6%96%87%E6%A1%A3)](https://openrl-docs.readthedocs.io/zh/latest/)

README_zh.md

@@ -12,7 +12,7 @@
 [![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
 
 [![Hits-of-Code](https://hitsofcode.com/github/OpenRL-Lab/openrl?branch=main)](https://hitsofcode.com/github/OpenRL-Lab/openrl/view?branch=main)
-[![codecov](https://codecov.io/gh/OpenRL-Lab/openrl/branch/main/graph/badge.svg?token=T6BqaTiT0l)](https://codecov.io/gh/OpenRL-Lab/openrl)
+[![codecov](https://codecov.io/gh/OpenRL-Lab/openrl/graph/badge.svg?token=T6BqaTiT0l)](https://codecov.io/gh/OpenRL-Lab/openrl)
 
 [![Documentation Status](https://readthedocs.org/projects/openrl-docs/badge/?version=latest)](https://openrl-docs.readthedocs.io/zh/latest/?badge=latest)
 [![Read the Docs](https://img.shields.io/readthedocs/openrl-docs-zh?label=%E4%B8%AD%E6%96%87%E6%96%87%E6%A1%A3)](https://openrl-docs.readthedocs.io/zh/latest/)