Collecting jupyterlab==0.21.0rc4
Downloading jupyterlab-0.21.0rc4-py2.py3-none-any.whl (4.5MB)
Saved /tmp/tmpi2wnroul/jupyterlab-0.21.0rc4-py2.py3-none-any.whl
Skipping jupyterlab, due to already being wheel.