hooray Conda 4.4+ breaks Kernda

Author: Sara Safavi

planet-notebook-docker/Dockerfile

@@ -73,6 +73,9 @@ RUN pip install --upgrade pip && \
         shapely \
         tqdm
 
+# Hotfix: downgrade Conda to avoid Kernda bug
+RUN conda install -y conda=4.3 
+
 # Activate Python2 kernel globally and upon kernel launch.
 USER root
 RUN pip install kernda --no-cache && \