Mypy-zope

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- Upgrade to Mypy-0.902.

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- Support for `classImplements` declarations (40).
- Support for `overload` decorator in interfaces (46)

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- Fix "Cannot determine consistent method resolution order (MRO)" error (34, 41)

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- Better type inference for contextmanagers and open() function: do not override
the default behavior for tese cases
- Support interfaces defined inside classes

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- Upgrade to Mypy-0.812.

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- Avoid failure when handling metaclasses of unknown type (28).