Improve util::pretty

[ken-matsui]

No description provided.

[codecov]

Codecov Report

Merging #364 (e27b25a) into master (324351a) will decrease coverage by 0.24%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #364      +/-   ##
==========================================
- Coverage   78.48%   78.24%   -0.25%     
==========================================
  Files          52       52              
  Lines        2445     2418      -27     
==========================================
- Hits         1919     1892      -27     
  Misses        526      526              

Impacted Files	Coverage Δ
tests/pretty.cpp	100.00% <ø> (ø)
include/poac/util/net.hpp	12.04% <100.00%> (ø)
include/poac/util/pretty.hpp	100.00% <100.00%> (ø)

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