feat: set default config to default argument

[tkrs]

No description provided.

[codecov]

Codecov Report

Merging #167 (e11fae0) into master (ad7ca13) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #167   +/-   ##
=======================================
  Coverage   65.85%   65.85%           
=======================================
  Files           5        5           
  Lines         328      328           
  Branches       21       21           
=======================================
  Hits          216      216           
  Misses        112      112           

Flag	Coverage Δ
unittests	65.85% <ø> (ø)

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Impacted Files	Coverage Δ
modules/core/src/main/scala/mess/Fmt.scala	54.63% <ø> (ø)

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