Won't install/doesn't work with 3.1.11.

[jinschoi]

I just tried to install this package on macos with jupyterlab 3.1.11.

1. The package install using "jupyter labextension" doesn't work because of conflicting dependencies.
2. I tried building it locally, and it appeared to build and install, but jupyter labextension list shows it as "enabled OK*". I don't know what the asterisk means, and I can't seem to find the answer anywhere.
3. When I try it, the keybindings in a cell seem the same as always, the default emacsy bindings on a Mac. Most obvious is that C-y is still bound to redo instead of yank.