Remove codecov and coverage from CircleCI setup

Author: melissawm

.circleci/config.yml

@@ -98,7 +98,7 @@ commands:
           name: Install Python dependencies
           command: |
             python -m pip install --user \
-                numpy<< parameters.numpy_version >> codecov coverage \
+                numpy<< parameters.numpy_version >> \
                 -r requirements/doc/doc-requirements.txt
             python -m pip install --no-deps --user \
                 git+https://github.com/matplotlib/mpl-sphinx-theme.git