Update publish instructions

Author: blink1073

README.md

@@ -109,11 +109,15 @@ If you make a change to the python code then you will need to restart the notebo
   npm login
   npm publish
   ```
-- Bundle the python package: `python setup.py sdist bdist_wheel`
-- Publish the package to PyPI:
+- Install publish dependencies:
+```bash
+pip install build twine
+```
+- Build the assets and publish
   ```bash
-  pip install twine
-  twine upload dist/<python package name>*
+  python -m build .
+  twine check dist/*
+  twine upload dist/*
   ```
 - Tag the release commit (`git tag <python package version identifier>`)
 - Update the version in `_version.py`, and put it back to dev (e.g. 0.1.0 -> 0.2.0.dev).