Merge pull request #3213 from plotly/jsrc2

bumping to JS 2.0.0 RC 2

Author: nicolaskruchten

Diff for: contributing.md

@@ -166,19 +166,6 @@ and
 [`pip`](https://pip.pypa.io/en/stable/reference/pip_install/#install-editable)
 documentation on _development mode_.
 
-### ipywidgets development install
-
-Run the following commands in your virtual environment to use the
-development version of `FigureWidget`,
-```bash
-(plotly_dev) $ jupyter nbextension enable --py widgetsnbextension
-(plotly_dev) $ jupyter nbextension install --py --symlink --sys-prefix plotlywidget
-(plotly_dev) $ jupyter nbextension enable --py --sys-prefix plotlywidget
-```
-To make plotly plots show up in JupyterLab, you also need to [install the plotly jupyterlab extensions][plotly-jl].
-
-[plotly-jl]: https://plot.ly/python/getting-started/#jupyterlab-support-python-35
-
 ### Configure black code formatting
 
 This repo uses the [Black](https://black.readthedocs.io/en/stable/) code formatter,
@@ -224,7 +211,7 @@ make that pull request!
 
 
 ## Update to a new version of Plotly.js
-First update the version of the `plotly.js` dependency in `packages/javascript/plotlywidget/package.json`.
+First update the version of the `plotly.js` dependency in `packages/javascript/jupyterlab-plotly/package.json`.
 
 Then run the `updateplotlyjs` command with:
 
@@ -238,7 +225,7 @@ the `plotly/plotly.js` GitHub repository (and place them in
 `plotly/package_data`). It will then regenerate all of the `graph_objs`
 classes based on the new schema.
 
-For dev branches, it is also possible to use `updateplotlyjsdev --devrepo reponame --devbranch branchname` to update to development versions of `plotly.js`. This will fetch the `plotly.js` in the CircleCI artifact of the branch `branchname` of the repo `reponame`. If `--devrepo` or `--devbranch` are omitted, `updateplotlyjsdev` defaults using `plotly/plotly.js` and `master` respectively. 
+For dev branches, it is also possible to use `updateplotlyjsdev --devrepo reponame --devbranch branchname` to update to development versions of `plotly.js`. This will fetch the `plotly.js` in the CircleCI artifact of the branch `branchname` of the repo `reponame`. If `--devrepo` or `--devbranch` are omitted, `updateplotlyjsdev` defaults using `plotly/plotly.js` and `master` respectively.
 
 ## Testing
 

Diff for: doc/requirements.txt

@@ -18,7 +18,7 @@ networkx
 squarify
 scikit-image==0.18.1
 scikit-learn
-sphinx
+sphinx==3.5.4
 sphinx_bootstrap_theme
 recommonmark
 pathlib