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Let's match cw-celerytask-helpers version.

This time no upper range.

This allows installation of cw-celerytask-helpers 0.8.0 which is still
compatible.

Why upgrading CubicWeb minimum version? We don't support 3.25 and
less, and even 3.26 should disappear but it is the last version
that supports Python 2 and it is in consequence sadly still used.
So it is better not to create illusion and be clear that we won't
add a fix for a too old version of CubicWeb. Projects must
upgrade, maintaining very old stuff is dirty work.

This is not backward compatible with celery 3, so pin celery>=4

See http://docs.celeryproject.org/en/4.0/whatsnew-4.0.html for summary of changes

Change attributes from celery.app.config to lower case.
Drop setting serializer to json in README and tests since json is now the
default serializer.

I had issues with test_workflow_group() where AsyncResult().get on the *group*
task_id hang. It looks related to our test infrastructure and AFAIK there is no
known usage of this for cubes using cubicweb-celerytask.
I think we must dig into this bug but I already spent enough time on this, so
let's move forward and skip this part of the test.