DOC: Update docs/releasing.md

docs/releasing.md

@@ -1,10 +1,30 @@
 # Releasing
 
-Create a new release at [Releases].
-
-The [`publish.yml` action]
-automatically publishes the release to [PyPI].
+1. Update the version in `pyproject.toml`.
+   If the update is a patch, run:
+   ```sh
+   poetry version patch
+   ```
+   See [poetry version document] for other valid bump rules.
+2. Commit the change and push.
+   ```sh
+   git commit -a
+   git push
+   ```
+3. Create a new release at [Releases].
+   The [`publish.yml` action]
+   automatically publishes the release to [PyPI].
+4. Update the version to prerelease.
+   ```sh
+   poetry version prepatch
+   ```
+5. Commit the change and push. For example:
+   ```sh
+   git commit -a -m 'v1.4.3-alpha.0'
+   git push
+   ```
 
+[poetry version document]: https://python-poetry.org/docs/cli/#version
 [`publish.yml` action]: https://github.com/kojiishi/east_asian_spacing/blob/main/.github/workflows/publish.yml
 [PyPI]: https://pypi.org/project/east-asian-spacing/
-[Releases]: https://github.com/kojiishi/east_asian_spacing/releases
+[Releases]: https://github.com/kojiishi/east_asian_spacing/releases