Introduce a method Crayon#color(string)

[youpong]

Description

• Reanme class Crayon from Color.
• Introduce a method Crayon#color(string)
• Re-implement print_process() by Crayon.

[codecov-commenter]

Codecov Report

Merging #76 (c70bb53) into main (0075e98) will increase coverage by 2.66%.
The diff coverage is 65.21%.

@@            Coverage Diff             @@
##             main      #76      +/-   ##
==========================================
+ Coverage   23.71%   26.37%   +2.66%     
==========================================
  Files           4        4              
  Lines         409      417       +8     
==========================================
+ Hits           97      110      +13     
+ Misses        312      307       -5     

Impacted Files	Coverage Δ
src/fetch.cpp	0.00% <0.00%> (ø)
src/main.cpp	24.59% <0.00%> (ø)
src/fetch.h	88.33% <85.71%> (+0.61%)	⬆️
src/util.cpp	56.75% <100.00%> (+10.37%)	⬆️

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