Nti.schema

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- Nothing changed yet.

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- Fix plurality of error message for fields with min length of 1.

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- Improve the speed of ``SchemaConfigured`` subclasses. See `issue 54
<https://github.com/NextThought/nti.schema/issues/54>`_.

This involves some caching, so be sure to read the documentation for
``nti.schema.schema`` if you ever mutate classes directly, or mutate
the results of ``schemadict``.

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- Require zope.interface 5.0.0 and related dependencies.

- Ensure all objects have consistent interface resolution orders.

- Add support for Python 3.8.

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- ``StrippedValidTextLine`` should accept single character lines.

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- Ensure ``StrippedValidTextLine`` correctly recognizes single character values
as stripped. Previously, 'b' would have been rejected.