Convert .coverage to lcov format for Coveralls

Author: atodorov

.github/workflows/testing.yml

@@ -50,14 +50,16 @@ jobs:
 
       - name: Execute tests
         run: |
-            pip install tox
+            pip install tox coverage-lcov
             pip install -e .[for_tests]
 
             export DJANGO=${{ matrix.django-version }}
             export PYTHON=${{ matrix.python-version }}
             export TOXENV=$(echo py${{ matrix.python-version }}-django${{ matrix.django-version }} | tr -d .)
             tox
 
+            coverage-lcov --output_file_path coverage/lcov.info
+
       - name: Coveralls
         uses: coverallsapp/github-action@master
         with: