Update release.md to remove package.json versioning

Author: marthacryan

Diff for: release.md

@@ -33,10 +33,6 @@ Manually update the versions to `X.Y.Z` in the files specified below.
    + this must be done at this point because the README gets baked into PyPI
  - `packages/python/plotly/plotly/_widget_version.py`:
    + Update `__frontend_version__` to `^X.Y.Z` (Note the `^` prefix)
- - `packages/python/plotly/js/package.json`
-   + Update `"version"` to `X.Y.Z`
- - `packages/python/plotly/js/package-lock.json`
-   + Update `"version"` to `X.Y.Z` in two places (to avoid dirty repo after rebuild)
  - Commit your changes on the branch:
    + `git commit -a -m "version changes for vX.Y.Z"`