Changelog for jupyter-jupyter_core-filesystem-20190823-bp155.2.12.x86_64.rpm :

* Fri Aug 23 2019 Todd R - Have jupyterlab-filesystem provide/obsolete jupyterlab-widgets. jupyterlab-widgets is no longer available as a python package.
* Fri May 24 2019 Todd R - Use %{_rpmmacrodir}
* Tue May 14 2019 Todd R - Initial version