simplify

.github/workflows/pythonpackage.yml

@@ -28,12 +28,13 @@ jobs:
       - name: Test with pytest
         run: |
           pip install .
-          pytest tests/ -v --cov=./rich --cov-report=xml:./coverage-${{ matrix.os }}.xml --cov-append
+          pytest ./tests -v --cov=./rich --cov-report=xml:./coverage.xml
 
       - name: Upload code coverage
         uses: codecov/codecov-action@v1
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
-          file: ./coverage-${{ matrix.os }}.xml
+          file: ./coverage.xml
           name: rich
-          flags: unittests-${{ matrix.os }}
+          flags: unittests
+          env_vars: OS,PYTHON