Merge branch 'master' into doc/remove-init-reference

Author: Theofilos Manitaras

.github/workflows/main.yml

@@ -29,7 +29,7 @@ jobs:
         coverage report -m
     - name: Upload Coverage to Codecov
       if:  matrix.python-version == '3.8'
-      uses: codecov/codecov-action@v1
+      uses: codecov/codecov-action@v1.0.5
       with:
         token: ${{ secrets.CODECOV_TOKEN }}
         fail_ci_if_error: true