FIX: PEP8 naming

[kmuehlbauer]

No description provided.

[codecov]

Codecov Report

Merging #257 into master will not change coverage.
The diff coverage is 96.52%.

@@           Coverage Diff           @@
##           master     #257   +/-   ##
=======================================
  Coverage   91.43%   91.43%           
=======================================
  Files          30       30           
  Lines        4567     4567           
=======================================
  Hits         4176     4176           
  Misses        391      391

Flag	Coverage Δ
#wradlibtests	91.43% <96.52%> (ø)	⬆️

Impacted Files	Coverage Δ
wradlib/io/iris.py	73.97% <0%> (ø)	⬆️
wradlib/io/rainbow.py	100% <100%> (ø)	⬆️
wradlib/dp.py	86.04% <100%> (ø)	⬆️
wradlib/io/radolan.py	97.01% <100%> (ø)	⬆️
wradlib/trafo.py	100% <100%> (ø)	⬆️
wradlib/georef/misc.py	100% <100%> (ø)	⬆️
wradlib/qual.py	100% <100%> (ø)	⬆️
wradlib/clutter.py	92.69% <100%> (ø)	⬆️
wradlib/vpr.py	82.05% <100%> (ø)	⬆️
wradlib/zr.py	100% <100%> (ø)	⬆️
... and 3 more

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