Fix example and clarify readme

[philipch07]

Description

Fix example output and clarifies readme usage for *f style logging.

Reference issue

Fixes #143

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.23%. Comparing base (62cbfd2) to head (4e0fa37).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #144   +/-   ##
=======================================
  Coverage   88.23%   88.23%           
=======================================
  Files           3        3           
  Lines         272      272           
=======================================
  Hits          240      240           
  Misses         24       24           
  Partials        8        8           

Flag	Coverage Δ
go	88.23% <ø> (ø)

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[JoTurk]

that was fast, thank you :)