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There are package files that contain a section for development versions. E.g., the tablicious package:

If I understand correctly, they set the .yaml file up to use the tarball that is dynamically generated by git (or GitHub?) for the head of a given branch. They left the date and the sha256 fields empty. That is probably a good idea for a "rolling version" that can change at any time.
I'd guess it would be ok to have that as the first section of versions - at least for some time. That first section is used as the default source when a user installs the package with pkg install -forge chebfun.
Once a first release is made, a new section describing that release could be added before the id: "dev" section.