codecov updates

- updated codecov badge to always point to main and uses token
- updated codecov GH action (avoid Node 16 deprecation warnings)
- changed .codecov.yml to point to main as default branch

.codecov.yml

@@ -1,3 +1,3 @@
 codecov:
-  branch: master
+  branch: main
 

.github/workflows/ci.yaml

@@ -114,7 +114,7 @@ jobs:
         pytest -v --disable-pytest-warnings --durations=20 --low-performance --cov=gromacs --cov-report=xml --color=yes ./tests
 
     - name: Codecov
-      uses: codecov/codecov-action@v3
+      uses: codecov/codecov-action@v4
       with:
         token: ${{ secrets.CODECOV_TOKEN }}
         name: codecov-${{ matrix.os }}-py${{ matrix.python-version }}

README.rst

@@ -34,7 +34,7 @@ that you are running simulations with sensible parameters.
 .. |build| image:: https://github.com/Becksteinlab/GromacsWrapper/actions/workflows/ci.yaml/badge.svg?branch=main
    :target: https://github.com/Becksteinlab/GromacsWrapper/actions/workflows/ci.yaml
    :alt: Build Status	     
-.. |cov| image:: https://codecov.io/gh/Becksteinlab/GromacsWrapper/badge.svg
+.. |cov| image:: https://codecov.io/gh/Becksteinlab/GromacsWrapper/branch/main/graph/badge.svg?token=LvbLZ49wxN
    :target: https://codecov.io/gh/Becksteinlab/GromacsWrapper
    :alt: Code Coverage
 .. |zenodo| image:: https://zenodo.org/badge/13219/Becksteinlab/GromacsWrapper.svg