Fix CI

[hugovk]

Some time between 1 December and 10 December test_prompt_for_confirmation started failing on the CI:

        # Test that the default reply is shown in uppercase.
        with PatchedAttribute(prompts, 'interactive_prompt', lambda p: 'y'):
            for default_value, expected_text in (True, 'Y/n'), (False, 'y/N'), (None, 'y/n'):
                with CaptureOutput(merged=True) as capturer:
                    assert prompt_for_confirmation("Are you sure?", default=default_value) is True
>                   assert expected_text in capturer.get_text()
E                   AssertionError: assert 'Y/n' in '\n'
E                    +  where '\n' = <bound method CaptureOutput.get_text of <humanfriendly.testing.CaptureOutput object at 0x7f4e25f69a90>>()
E                    +    where <bound method CaptureOutput.get_text of <humanfriendly.testing.CaptureOutput object at 0x7f4e25f69a90>> = <humanfriendly.testing.CaptureOutput object at 0x7f4e25f69a90>.get_text

The same failure happens if I try the older commit which worked before: 44cbc41.

Checking the changed dependencies between those two and through a process of trial and error, it passes with coloredlogs==14.0 and fails with coloredlogs==14.1.

Here's a diff of those releases: xolox/python-coloredlogs@14.0...14.1

In the meantime, let's pin.

[hugovk]

And fix PyPy2 by installing cryptography < 3, a dependency of coveralls.

Version 2.9 was the last version that passed tests, and 3.2.1 the first one that failed tests.

[xolox]

Hi Hugo, thanks for the feedback & analysis. I merged your changes to get cryptography pinned, then I fixed the upstream bug in coloredlogs (including a new regression test) and I've since bumped the test dependency in humanfriendly.

A general note about CI: I'm looking into replacing Travis CI (no longer available for open source projects in any useful capacity, as you undoubtedly know) with e.g. GitHub Actions but have zero experience with the latter, so it may be a while until I have CI infrastructure back up and running...

[hugovk]

I have lots of experience with GitHub Actions, I'll make a PR!

[hugovk]

Please see PR #54.