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Enhancements
* Apptools now have a changelog!
* Preferences system defaults to utf-8 encoded string with ConfigObj providing
better support for unicode in the PreferenceHelper (41, 45).
* Added a traitsified backport of Python 3's lru_cache (39).
* Added PyTables support to the io submodule (19, 20, and 24 through 34).
* Added a SelectionService for managing selections within an application (15, 16, 17,
23).