Pytest-tap

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* Last supported version for Python 2.
* Pin tap.py to a version range that supports Python 2.

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* Handle failures that occur from setup.
This will catch errors that may happen in fixtures.
* Drop support for Python 3.4 (it is end-of-life).
* Add support for Python 3.7.

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* Improve xfail handling.
Honor strict xfail mode.
Use TODO instead of SKIP directive to better align with TAP specification.
* Output the plan line (``1..N``) first.

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* Update output format to match closer to pytest styling.
* Drop support for Python 3.3 (it is end-of-life).

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* Add support for Python 3.6.
* Fix crash when running with pytest-xdist (27).

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* Update to tap.py 2.0.
This update drops the indirect dependencies on nose and pygments.
* Improve handling of skips and xfails.
* Suppress `` TAP results for TestCase`` for streaming.
This header makes little sense for pytest's test function paradigm.
Including the header generated extra noise for each function.
* Drop support for Python 2.6