Release v7

• Teardown the handler after test run

Release 6

• Simple way to check that nothing was logged (on any level or a specific one):

    assert NOTHING in logs.debug

• Helper to check that several lines were logged one after the other:

    assert Sequence(
        "Got 1 error and \d+ warnings:",
        Exact("  error: bar"),
    ) in logs.debug

• Show proper message when "not in" assertion is used (thanks Diego Mascialino)