Fix error when skipping string with unicode

[francoispqt]

No description provided.

[codecov-io]

Codecov Report

Merging #91 into master will decrease coverage by 0.03%.
The diff coverage is 60%.

@@            Coverage Diff            @@
##           master     #91      +/-   ##
=========================================
- Coverage   98.74%   98.7%   -0.04%     
=========================================
  Files          36      36              
  Lines        5161    5166       +5     
=========================================
+ Hits         5096    5099       +3     
- Misses         51      52       +1     
- Partials       14      15       +1

Impacted Files	Coverage Δ
decode_string.go	98.8% <60%> (-1.2%)	⬇️

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