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Use compatible release (tilde-style) versioning for dependencies. Assuming the maintainers of the dependencies use semantic versioning this will prevent backwards-incompatible changes from being unexpectedly introduced, while still getting updates that are compatible with what currently works.
I added an additional constraint to the traitlets dependency, which satisfies option 1 of #426. However, option 3 is my preferred solution, which would allow for the removal of the second version constraint on traitlets. I submitted a separate PR #429 for that change.