run black -l79 against code

[cabiad]

TODO: Add black -l79 --check to CI as well ...

[codecov]

Codecov Report

Merging #75 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #75   +/-   ##
=======================================
  Coverage   96.39%   96.39%           
=======================================
  Files           8        8           
  Lines         333      333           
  Branches       46       46           
=======================================
  Hits          321      321           
  Misses          6        6           
  Partials        6        6

Flag	Coverage Δ
#py27	96.39% <100%> (ø)	⬆️
#py36	96.39% <100%> (ø)	⬆️
#py37	96.39% <100%> (ø)	⬆️

Impacted Files	Coverage Δ
codewatch/__init__.py	100% <100%> (ø)	⬆️
codewatch/loader.py	100% <100%> (ø)	⬆️
codewatch/file_walker.py	100% <100%> (ø)	⬆️
codewatch/defaults.py	100% <100%> (ø)	⬆️
codewatch/assertion.py	100% <100%> (ø)	⬆️
codewatch/node_visitor.py	88.88% <100%> (ø)	⬆️

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