Fix: #30 Mutli channel wave file

[kamo-naoyuki]

#30

[codecov-io]

Codecov Report

Merging #31 into master will decrease coverage by 5.66%.
The diff coverage is 64.55%.

@@            Coverage Diff             @@
##           master      #31      +/-   ##
==========================================
- Coverage   87.69%   82.03%   -5.67%     
==========================================
  Files           6        7       +1     
  Lines        1024     1308     +284     
==========================================
+ Hits          898     1073     +175     
- Misses        126      235     +109

Impacted Files	Coverage Δ
kaldiio/matio.py	90.41% <100%> (+0.31%)	⬆️
kaldiio/utils.py	83.91% <100%> (-0.43%)	⬇️
kaldiio/wavio.py	92.3% <100%> (+1.39%)	⬆️
kaldiio/python_wave.py	63.15% <63.15%> (ø)

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