Update release.md

Author: LiamConnors

Diff for: release.md

@@ -35,7 +35,7 @@ Manually update the versions to `X.Y.Z` in the files specified below.
 
  - `CHANGELOG.md`
    + update the release date
- - `packages/python/plotly/README.md`
+ - `README.md`
    + this must be done at this point because the README gets baked into PyPI
  - `plotly/_widget_version.py`:
    + Update `__frontend_version__` to `^X.Y.Z` (Note the `^` prefix)