fix collections.abc.Iterable issue for python 3.8+ #3
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https://stackoverflow.com/questions/53978542/how-to-use-collections-abc-from-both-python-3-8-and-python-2-7/
In Python 3.3 "abstract base classes" in collections (like MutableMapping or MutableSequence) were moved to second-level module collections.abc. So in Python 3.3+ the real type is collections.abc.MutableMapping and so on. Documentation states that the old alias names (e.g. collections.MutableMapping) will be available up to Python 3.7 (currently the latest version), however in 3.8 these aliases will be removed.
So, we should use collections.abc