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- Support character sets.
Example: ``srLatn`` and ``srCyrl`` will be added to language ``sr`` (Serbian).
See https://github.com/collective/plone.app.locales/issues/326
You can choose which one to use by setting either ``srLatn`` or ``srCyrl``
in environment variable ``zope_i18n_allowed_languages``.
- Support and test Python 3.8 and 3.9.
Full supported list is now: 2.7, 3.5, 3.6, 3.7, 3.8, 3.9, PyPy, PyPy3.