Add verbose flag to debug ci

Author: marthacryan

.circleci/config.yml

@@ -64,7 +64,7 @@ commands:
           command: |
             cd packages/python/plotly
             . venv/bin/activate
-            pytest plotly/tests/test_optional
+            pytest plotly/tests/test_optional -v
           no_output_timeout: 40m
       - run:
           name: Test utils