setup: exclude celery 4.4.4 which is broken due to unexpressed dependency Celery 4.4.4 introduced the use of the 'future' package but forgot to express it in its dependencies. We could add the missing dependency on 'future' in Kallithea, but since the problem is already fixed upstream shortly after 4.4.4 was released [1], we can be sure that the next release (presumably 4.4.5) will contain the fix. [1] https://github.com/celery/celery/pull/6146

# requirements.txt file for use as "pip install -r requirements.txt" as a
# readthedocs compatible alternative to "pip install -e ." which is a working
# alternative to "setup.py develop" which doesn't work with Mercurial 3.7
.