Jupyter Notebook Version Conflict Following Conda Installation Instructions

[dcato98]

Bug
Following the Conda pre-installation and installation instructions in README.md in Linux results in the following version conflict:
ERROR: notebook 6.0.3 has requirement tornado>=5.0, but you'll have tornado 4.5.3 which is incompatible.

Then when running jupyter notebook, the browser tab fails to display any files and there is no option to create a Python notebook. This was also noticed by youben11 here.

To Reproduce
Steps to reproduce the behavior:

conda create -n pysyft python=3.7
conda activate pysyft # some older version of conda require "source activate pysyft" instead.
conda install jupyter notebook
pip install syft[udacity]

Workaround
Per this closed issue, install jupyter notebook at the same time as syft using:

conda create -n pysyft python=3.7
conda activate pysyft # some older version of conda require "source activate pysyft" instead.
pip install syft[udacity,notebooks]

To test the workaround, I've been able to successfully open and run the first example jupyter notebook.

Running conda list shows the following versions were installed:
tornado 4.5.3
ipykernel 5.2.0
ipython 7.13.0
ipython-genutils 0.2.0
ipywidgets 7.5.1
jupyter 1.0.0
jupyter-client 6.1.2
jupyter-console 6.1.0
jupyter-core 4.6.3
notebook 5.7.8

[karlhigley]

This has been fixed in the requirements file in #3204, but people with installations from before the fix will still need to run the workaround mentioned here.