Release 4.3.0 (plotly#1894)

* Bump plotly.js to 1.51.1 in jupyterlab-plotly extension
* Update CHANGELOG for 4.3.0
* Bump plotlywidget and jupyterlab-plotly versions to 1.3.0
* Update versions in README

Release 4.3.0 (plotly#1894)

* Bump plotly.js to 1.51.1 in jupyterlab-plotly extension
* Update CHANGELOG for 4.3.0
* Bump plotlywidget and jupyterlab-plotly versions to 1.3.0
* Update versions in README

Update CHANGELOG and README for version 4.2.1

Release 4.2.0 (plotly#1823)

* Added 4.2.0 CHANGELOG entry
* Update README to version 4.2.0
* Bump extension versions

Release 4.2.0 (plotly#1823)

* Added 4.2.0 CHANGELOG entry
* Update README to version 4.2.0
* Bump extension versions

CHANGELOG typo

CHANGELOG typo

jupyterlab-plotly@1.1.2 to fix publication

Release 4.1.0 (plotly#1704)

* Added 4.1 CHANGELOG
* Update README installation instructions
* Bump versions of plotlywidget and jupyterlab-plotly to 1.1.0
* Remove px __version__ var now that px is integrated into plotly.py
* Fix facet row label ordering
* Fix row_titles to honor start_cell specification

Release 4.1.0 (plotly#1704)

* Added 4.1 CHANGELOG
* Update README installation instructions
* Bump versions of plotlywidget and jupyterlab-plotly to 1.1.0
* Remove px __version__ var now that px is integrated into plotly.py
* Fix facet row label ordering
* Fix row_titles to honor start_cell specification