link codecov badge and update readme

.github/workflows/tests.yml

@@ -32,7 +32,7 @@ jobs:
         pip install -r requirements/requirements-core.txt
         pip install .
     
-    # - name: Run tests
-    #   run: |
-    #     pytest --cov-report term --cov=s2scat --cov-config=.coveragerc 
-    #     codecov --token 298dc7ee-bb9f-4221-b31f-3576cc6cb702
+    - name: Run tests
+      run: |
+        pytest --cov-report term --cov=s2scat --cov-config=.coveragerc 
+        codecov --token 99e22b3a-3f1d-40da-96af-22d2e98c31d6

README.md

@@ -1,5 +1,5 @@
 [![image](https://github.com/astro-informatics/s2scat/actions/workflows/tests.yml/badge.svg?branch=main)](https://github.com/astro-informatics/s2scat/actions/workflows/tests.yml)
-[![image](https://codecov.io/gh/astro-informatics/s2scat/branch/main/graph/badge.svg?token=7QYAFAAWLE)](https://codecov.io/gh/astro-informatics/s2scat)
+[![codecov](https://codecov.io/gh/astro-informatics/s2scat/graph/badge.svg?token=LTSRXQVHIA)](https://codecov.io/gh/astro-informatics/s2scat)
 [![image](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
 [![image](https://badge.fury.io/py/s2scat.svg)](https://badge.fury.io/py/s2scat)
 [![image](http://img.shields.io/badge/arXiv-xxxx.xxxxx-orange.svg?style=flat)](https://arxiv.org/abs/xxxx.xxxxx)