fix deprecation warnings for collections.abc (will break in Python 3.9)#1865

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terencehonles:fix-collections.abc-deprecation-warnings

Commits on Oct 29, 2019

fix deprecation warnings for collections.abc (will break in Python 3.9)
terencehonles
committed

Commits on Dec 12, 2019

fix MutableMapping import in tests/unit/test_parsers.py
terencehonles
committed