Log Message:
py-test: updated to 3.6.2

Pytest 3.6.2:

Bug Fixes
Fix regression in Node.add_marker by extracting the mark object of a MarkDecorator.
Warnings without location were reported as None. This is corrected to now report \ 
<undetermined location>.
Continue to call finalizers in the stack when a finalizer in a former scope \ 
raises an exception.
Fix encoding error with print statements in doctests

Improved Documentation
Add documentation for the --strict flag.

Trivial/Internal Changes
Update old quotation style to parens in fixture.rst documentation.
Improve display of hint about --fulltrace with KeyboardInterrupt.
pytest’s testsuite is no longer runnable through python setup.py test – \ 
instead invoke pytest or tox directly.
Fix typo in documentation