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This is somewhat related to #29.
My own motivation is that we have a temporary local fork of an old version of Twisted in Launchpad, currently versioned
13.0.0-p2, and as part of trying to convert from buildout to pip (which is a prerequisite for upgrading to a modern Twisted, for tedious reasons) I discovered that the version we have isn't PEP 440-compliant. That caused me to look into whether Twisted's current versioning code supported PEP 440 postreleases, and discovered that it doesn't; hence this PR.