Log Message:
py-jupyter_core: updated to 4.9.1

4.9.1

- Add a workaround for virtualenv for getting the user site directory.

4.9.0

- Add Python site user base subdirectories to config and data user-level paths \ 
if ``site.ENABLE_USER_SITE`` is True. One way to disable these directory \ 
additions is to set the ``PYTHONNOUSERSITE`` environment variable. These \ 
locations can be customized by setting the ``PYTHONUSERBASE`` environment \ 
variable.

4.8.2

jupyter_core 4.8.1 was released the same day as 4.8.0 and also included the fix \ 
below for the Windows tests. Unfortunately, the 4.8.1 release commit and tag \ 
were not pushed to GitHub. We are releasing 4.8.2 so we have a commit and tag in \ 
version control.

- Fix windows test regression

4.8.0

jupyter-core now has experimental support for PyPy (Python 3.7). Some features \ 
are known not to work due to limitations in PyPy, such as hidden file detection \ 
on Windows.

- Print an error message instead of an exception when a command is not found
- Return canonical path when using ``%APPDATA%`` on Windows
- Print full usage on missing or invalid commands
- Remove dependency on ``pywin32`` package on PyPy
- Update packages listed in ``jupyter --version``
- Inherit base aliases/flags from traitlets Application, including \ 
``--show-config`` from traitlets 5
- Trigger warning when trying to check hidden file status on PyPy