Update link to logging standard.

[codecov-io]

Codecov Report

Merging #30 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #30   +/-   ##
=======================================
  Coverage   99.55%   99.55%           
=======================================
  Files          14       14           
  Lines         451      451           
  Branches       60       60           
=======================================
  Hits          449      449           
  Misses          1        1           
  Partials        1        1

Impacted Files	Coverage Δ
src/dockerflow/logging.py	100% <ø> (ø)	:arrow_up:

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[jezdez]

Thanks!