Install seaborn in circleci

Author: Guillaume Lemaitre

circle.yml

@@ -29,6 +29,7 @@ dependencies:
     - sudo -E apt-get -yq --no-install-suggests --no-install-recommends --force-yes install dvipng texlive-latex-base texlive-latex-extra
     - pip install --upgrade cython numpydoc
     - pip install --upgrade scikit-learn
+    - pip install --upgrade seaborn
 
   # The --user is needed to let sphinx see the source and the binaries
   # The pipefail is requested to propagate exit code