Ignore D202 where necessary

[rytilahti]

This is required as PyCQA/pydocstyle#426 does not
fix the issue for async def'd inner functions, causing
D202: No blank lines allowed after function docstring (found 1)

The ignores can be removed when PyCQA/pydocstyle#466 gets fixed.

[codecov-io]

Codecov Report

Merging #50 into master will decrease coverage by 0.48%.
The diff coverage is 62.50%.

@@            Coverage Diff             @@
##           master      #50      +/-   ##
==========================================
- Coverage   70.68%   70.20%   -0.49%     
==========================================
  Files           9        9              
  Lines        1071     1094      +23     
  Branches      153      157       +4     
==========================================
+ Hits          757      768      +11     
- Misses        293      305      +12     
  Partials       21       21              

Impacted Files	Coverage Δ
kasa/cli.py	51.79% <0.00%> (ø)
kasa/smartplug.py	100.00% <ø> (ø)
kasa/smartdevice.py	83.39% <53.33%> (-3.20%)	⬇️
kasa/smartstrip.py	85.13% <100.00%> (+0.41%)	⬆️

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