Support multibyte characters

[kamo-naoyuki]

No description provided.

[codecov-io]

Codecov Report

Merging #29 into master will increase coverage by 0.15%.
The diff coverage is 95.45%.

@@            Coverage Diff             @@
##           master      #29      +/-   ##
==========================================
+ Coverage   87.53%   87.69%   +0.15%     
==========================================
  Files           6        6              
  Lines        1003     1024      +21     
==========================================
+ Hits          878      898      +20     
- Misses        125      126       +1

Impacted Files	Coverage Δ
kaldiio/utils.py	84.34% <100%> (-0.12%)	⬇️
kaldiio/matio.py	90.1% <94.59%> (+0.33%)	⬆️

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