Strict mypy

[staticdev]

• Added strict configs.
• Added missing types.
• TODO Create another issue for definitive pytest_mock stubs / add temporary private stubs for pytest_mock. There are some very basic ones here: https://github.com/srittau/python-stubs/tree/master/stubs/pytest_mock.

[codecov-commenter]

Codecov Report

Merging #110 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #110   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines           31        31           
  Branches         3         3           
=========================================
  Hits            31        31           

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