[FIX] test_pylint: incompatibility between pylint 1.6 and python 3.6
[FIX] test_pylint: incompatibility between pylint 1.6 and python 3.6

reference: https://github.com/PyCQA/pylint/issues/1349

pylint 1.6 and python 3.5 (and below) should work fine, so no need to
force people to upgrade there.
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