Log Message:
py-test: updated to 3.7.2

pytest 3.7.2:

Bug Fixes
- Fix filterwarnings not being registered as a builtin mark.
- Fix test collection from packages mixed with normal directories.
- Fix infinite recursion during collection if a pytest_ignore_collect hook \ 
returns False instead of None.
- Fix bug where decorated fixtures would lose functionality (for example \ 
@mock.patch).
- Fix bug where importing modules or other objects with prefix pytest_ prefix \ 
would raise a PluginValidationError.
- Fix AttributeError during teardown of TestCase subclasses which raise an \ 
exception during __init__.
- Fix traceback reporting for exceptions with __cause__ cycles.