Pyhamcrest

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Drop formal support for 2.x

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Add support up to Python 3.8

Fix 66 - deprecate contains() in favour of contains_exactly().
Fix 72 - make has_properties mismatch description less verbose by adding option to AllOf not to include matcher description in its mismatch messages.
Fix 82 - include exception details in mismatch description.

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Fix 56 - incorrect handling of () in ``is_`` matcher
Fix 60 - correct calling API call with args

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* Fix 54 - Make instance_of work with tuple like isinstance and unittest's assertIsInstance

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* Fix 52 - bad handling when reporting mismatches for byte arrays in Python 3