migrate from unittest to pytest

[LostInDarkMath]

Closes #113

[coveralls]

Pull Request Test Coverage Report for Build 21838532637

Details

• 17 of 17 (100.0%) changed or added relevant lines in 1 file are covered.
• 2 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+3.4%) to 99.14%

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Files with Coverage Reduction	New Missed Lines	%
pedantic/decorators/fn_deco_does_same_as_function.py	1	96.67%
pedantic/decorators/fn_deco_trace_if_returns.py	1	96.0%

Totals
Change from base Build 21688680529:	3.4%
Covered Lines:	1800
Relevant Lines:	1817

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💛 - Coveralls