Validator-collection

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* 64: Fixed URL validator and checker to ensure that protocol is case insensitive.
* 63: Added a MIME type validator and checker.
* ENHANCEMENT: Added ``missing_as_none`` option to ``checkers.are_dicts_equivalent()``.
* ENHANCEMENT: Added ``strict_typing`` option to ``checkers.are_equivalent()``.

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* 59: Fixed URL and domain validation to fail properly on unsafe characters.

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* 54: Fixed the incorrect raising of a ``TypeError`` by ``validators.url()``.

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* 49: Added ``timedelta()`` validator and ``is_timedelta()`` checker.
* 50: Added Python 3.8 to the test matrix.

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* 43: Modified how ``__init__.py`` reads version information.
* 45: Fixed false-positives and false-negatives in iterable validation.

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* 39: Removed artifact ``print()`` statement in variable name validator.
* 40: Fixed bug in ``checkers.is_type()`` that would return false negatives when
evaluating an ``abc.ABCMeta`` object (an Abstract Base Class ``type``-equivalent
object) as opposed to an instance that inherits from ``abc.ABCMeta``.

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