Update CI.yml

Author: fancaiyu

.github/workflows/CI.yml

@@ -37,13 +37,13 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install .
           pip install coverage
           pip install pytest pytest-cov
           pip install -r requirements.txt
 
       - name: Run tests
         run: |
+          cat codecov.yml | curl --data-binary @- https://codecov.io/validate
           export PYTHONPATH=MCintegration
           pytest --cov --cov-report=xml