Dependencies conflict debug support (local only)

[penguinolog]

typing for python < 3.7 only
Tox target dep-graph allows to debug dependencies conflict locally.

[coveralls]

Pull Request Test Coverage Report for Build 44

• 0 of 0 (NaN%) changed or added relevant lines in 0 files are covered.
• 48 unchanged lines in 4 files lost coverage.
• Overall coverage remained the same at 98.662%

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Files with Coverage Reduction	New Missed Lines	%
threaded/_base_gthreadpooled.py	3	100.0%
threaded/_gthreadpooled2.py	12	100.0%
threaded/_base_threaded.py	13	97.44%
threaded/_threaded2.py	20	100.0%

Totals
Change from base Build 42:	0.0%
Covered Lines:	295
Relevant Lines:	299

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💛 - Coveralls