tests: bump pytest version requirement to allow 3.x pytest is an active project, since our previous requirement setting there have been many releases, with new features and bug fixes. One of the improvements in pytest-3.0 is that 'yield_fixture' (a fixture that can embed cleanup code after a yield) is no longer different than 'fixture', i.e. a standard fixture supports the yield cleanup mechanism. We will switch to use that when we make 3.0 mandatory.

[pytest]
# only look for tests in kallithea/tests
python_files = kallithea/tests/**/test_*.py
addopts =
    # --verbose
    # show extra test summary info as specified by chars (f)ailed, (E)error, (s)skipped, (x)failed, (X)passed, (w)warnings.
    -rfEsxXw
    # Shorter scrollbacks; less stuff to scroll through
    --tb=short