version of kombu needs to be updated for newer python

[adenbley]

python 2.7.11 does not work with the version of kombu in requriements.txt.

[scarroll32]

Update kombu to at least 3.0.30 in requirements/dev.txt

kombu==3.0.30

[ernstki]

Just to add a bit of useful context (hopefully), here is the (now-closed) Kombu issue affecting Python 2.7.11 and this appears to be the backtrace you get at kombu==3.0.24 which goes away after following @seanfcarroll's advice, above:

$ python app.py 
Traceback (most recent call last):
  File "app.py", line 7, in <module>
    from celery import Celery
  File "/Users/kernst/devel/MLU/GrosseLab/flask-celery-example/venv/lib/python2.7/site-packages/celery/__init__.py", line 130, in <module>
    from celery import five
  File "/Users/kernst/devel/MLU/GrosseLab/flask-celery-example/venv/lib/python2.7/site-packages/celery/five.py", line 149, in <module>
    from kombu.utils.compat import OrderedDict  # noqa
  File "/Users/kernst/devel/MLU/GrosseLab/flask-celery-example/venv/lib/python2.7/site-packages/kombu/utils/__init__.py", line 19, in <module>
    from uuid import UUID, uuid4 as _uuid4, _uuid_generate_random
ImportError: cannot import name _uuid_generate_random

It might be helpful to change the issue title to be/include the error message ImportError: cannot import name _uuid_generate_random.