delete buf

[naoyukis]

buf(bytes.Buffer) is actually unused.

[codecov-commenter]

Codecov Report

Merging #63 (699629e) into master (a1c5ae5) will decrease coverage by 0.31%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master     #63      +/-   ##
=========================================
- Coverage    6.64%   6.33%   -0.32%     
=========================================
  Files           3       3              
  Lines         602     600       -2     
=========================================
- Hits           40      38       -2     
  Misses        561     561              
  Partials        1       1              

Impacted Files	Coverage Δ
noncolorable.go	93.10% <ø> (-0.45%)	⬇️

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[mattn]

Thank you