restricting code coverage to only master branch

Signed-off-by: Kharude, Sachin <sachin.kharude@here.com>

Author: Kharude, Sachin

.github/workflows/main.yml

@@ -55,9 +55,9 @@ jobs:
         pytest -v --durations=10 --cov-report=xml --cov=xyzspaces tests
 
     - name: Upload coverage to Codecov
+      if: github.ref == 'refs/heads/master' && matrix.os == 'ubuntu-latest' && matrix.python-version == '3.8'
       uses: codecov/codecov-action@v1
       with:
-        token: ${{ secrets.CODECOV_TOKEN }}
         file: ./coverage.xml
         flags: unittests