Fix codecov badge

Author: eivindjahren

README.md

@@ -4,7 +4,7 @@
 [![PyPI - Python Version](https://img.shields.io/pypi/pyversions/ert)](https://img.shields.io/pypi/pyversions/ert)
 [![Code Style](https://github.com/equinor/ert/actions/workflows/style.yml/badge.svg)](https://github.com/equinor/ert/actions/workflows/style.yml)
 [![Type checking](https://github.com/equinor/ert/actions/workflows/typing.yml/badge.svg)](https://github.com/equinor/ert/actions/workflows/typing.yml)
-[![codecov](https://codecov.io/gh/equinor/ert/branch/add_code_coverage/graph/badge.svg?token=keVAcWavZ1)](https://codecov.io/gh/equinor/ert)
+[![codecov](https://codecov.io/gh/equinor/ert/graph/badge.svg?token=keVAcWavZ1)](https://codecov.io/gh/equinor/ert)
 [![License: GPL v3](https://img.shields.io/badge/License-GPLv3-blue.svg)](https://www.gnu.org/licenses/gpl-3.0)
 
 ERT - Ensemble based Reservoir Tool - is designed for running