Bump to version 0.31.0-alpha.0

Bump to 0.30.1

Use latest nbdime (jupyterlab#926)

nbdime styles are not imported (jupyterlab#919)

* Import some styles from nbdime-jupyterlab

* Import additional styles from nbdime

* Move import to base

* Correct comment position

Merge pull request jupyterlab#918 from meeseeksmachine/auto-backport-…

…of-pr-917-on-jlab-2

Backport PR jupyterlab#917 on branch jlab-2 (Change commitAndPush default to false)

Merge pull request jupyterlab#875 from jupyterlab/fcollonval-patch-1

Bump to beta.2

Add jupyter_packaging for publication

Remove version matching

Version are aligned by code design

Bump to v0.23.3 (jupyterlab#850)

Bump to 0.23.2 (jupyterlab#832)

* Update package.json

* Update _version.py