Log Message:
py-test: updated to 4.3.1

pytest 4.3.1:

Bug Fixes
- Logging messages inside pytest_runtest_logreport() are now properly captured \ 
and displayed.
- Improve validation of contents written to captured output so it behaves the \ 
same as when capture is disabled.
- Fix AttributeError: FixtureRequest has no 'confg' attribute bug in \ 
testdir.copy_example.

Trivial/Internal Changes
- Avoid pkg_resources import at the top-level.