change notebook to pipenv in jupuyterlab code example

Example: jupyter kernel pipenv

pipenv install ipykernel
pipenv shell
# This will bring up a terminal in your virtualenv like this:

(my-virtualenv-name) bash-4.4$
In that shell do:

python -m ipykernel install --user --name=my-virtualenv-name
#Launch jupyter notebook:

jupyter notebook
#In your notebook, Kernel -> Change Kernel.
#Your kernel should now be an option.