Update build.yml

Author: Paulinakhew

.github/workflows/build.yml

@@ -26,6 +26,5 @@ jobs:
       - name: upload coverage to Codecov
         uses: codecov/codecov-action@v1
         with:
-          token: ${{ secrets.CODECOV_TOKEN }}
           name: codecov-umbrella
           fail_ci_if_error: true