fix coverage upload to codecov

Author: patinthehat

.github/workflows/run-tests.yml

@@ -34,11 +34,11 @@ jobs:
         run: composer update --${{ matrix.stability }} --prefer-dist --no-interaction
 
       - name: Execute tests
-        run: ./vendor/bin/phpunit
+        run: ./vendor/bin/phpunit --coverage-clover clover.xml
 
       - name: Upload coverage to Codecov
         uses: codecov/codecov-action@v1
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
-          files: ./build/log/clover.xml
+          files: clover.xml