Added FORMAT_BOX_CHARS

[phsym]

Closes #83

[codecov]

Codecov Report

Merging #93 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #93   +/-   ##
=======================================
  Coverage   83.83%   83.83%           
=======================================
  Files           5        5           
  Lines        1157     1157           
=======================================
  Hits          970      970           
  Misses        187      187

Impacted Files	Coverage Δ
src/format.rs	69.86% <100%> (+1.14%)	⬆️
src/lib.rs	84.8% <100%> (-0.28%)	⬇️

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