Also fix pubnub ~= version that is no longer recognized in pip 19.0
This happens when jsonref 0.1 is used, but the warning is now fixed in jsonref 0.2:
% python3 -W default
Python 3.7.3 (default, Mar 27 2019, 09:23:15)
[Clang 10.0.1 (clang-1001.0.46.3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import civis
/usr/local/lib/python3.7/site-packages/jsonref.py:8: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated, and in 3.8 it will stop working
This happens when jsonref 0.1 is used, but the warning is now fixed in jsonref 0.2: