docs: update python strategy update files in README.md (#415)

README.md

@@ -84,7 +84,7 @@ Release Please automates releases for the following flavors of repositories:
 | release type | description |
 |:---:|---|
 | `node` | [A Node.js repository, with a package.json and CHANGELOG.md](https://github.com/yargs/yargs) |
-| `python` | [A Python repository, with a setup.py, setup.cfg, version.py and CHANGELOG.md](https://github.com/googleapis/python-storage) |
+| `python` | [A Python repository, with a setup.py, setup.cfg, version.py and CHANGELOG.md](https://github.com/googleapis/python-storage) and optionally a pyproject.toml and a <project>/\_\_init\_\_.py |
 | `php` | [A php composer package with composer.json and CHANGELOG.md](https://github.com/setnemo/asterisk-notation)
 | `ruby` | [A Ruby repository, with version.rb and CHANGELOG.md](https://github.com/google/google-id-token) |
 | `terraform-module` | [A terraform module, with a version in the README.md, and a CHANGELOG.md](https://github.com/terraform-google-modules/terraform-google-project-factory) |