Contributors will henceforth be asked to include a `RELEASE.md` file
containing the release type and summary of changes, which will be used
by the continuous integration (CI) system to automatically publish a new
release to PyPI when the pull request is merged.
For more details, see: https://github.com/autopub/autopub
While it may make sense to switch to an alternate build system (such as
Poetry) at some point, at this early stage it seems prudent to designate
setuptools as the build system in pyproject.toml until the more modern
build system tooling matures.
This could facilitate publishing new versions of Pelican as well as make
it easier for Poetry users to install Pelican via: `poetry install`
Closes#2450
