[jupyterhub] add python packages: ffmpeg-python, neo

jupyterhub/base/Dockerfile

@@ -81,6 +81,8 @@ RUN mkdir -p /usr/local/venv && \
         ipykernel \
         tqdm \
         sklearn \
+        ffmpeg-python \
+        neo \
         'mxnet-cu101>=1.6.0,<1.7.0' \
         && \
     ipython kernel install --name=default