rcloud.jupyter only supports older jupyter packages

[gordonwoodhull]

I first heard about this in September.

APIs have changed in nbconvert, nbformat, maybe ipykernel and jupyter-core too.

In order to get Jupyter cells working in RCloud, I had to do

sudo pip3 install --no-cache -I ipykernel==4.8.2 jupyter-client==5.2.3 jupyter-core==4.4.0 nbconvert==5.3.1 nbformat==4.4.0 tornado==5.0.2

(Yes, pip... all Jupyter Ubuntu packages have disappeared, Jupyter recommends Anaconda now...)

[gordonwoodhull]

None of the updates look complicated - just parameters added to methods as far as I could see.