Deprecation warning, affects compatibility with Python 3.8 #487
Description
When running tests with pytest, I noticed some deprecation warnings popping up. It appears that starting in Python 3.8 we will start to see some issues.
/python3.7/site-packages/jsonschema/compat.py:6:
DeprecationWarning: Using or importing the ABCs from 'collections' instead of
from 'collections.abc' is deprecated, and in 3.8 it will stop working
from collections import MutableMapping, Sequence # noqa