Add rlevdur

[takenori-y]

include breaking change

[codecov]

Codecov Report

Merging #45 (26d162d) into next_release (cb03339) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 26d162d differs from pull request most recent head a745199. Consider uploading reports for the commit a745199 to get more accurate results

@@              Coverage Diff              @@
##           next_release      #45   +/-   ##
=============================================
  Coverage         99.80%   99.80%           
=============================================
  Files               161      163    +2     
  Lines              4078     4123   +45     
=============================================
+ Hits               4070     4115   +45     
  Misses                8        8           

Flag	Coverage Δ
unittests	99.80% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
diffsptk/core/fftcep.py	100.00% <ø> (ø)
diffsptk/core/__init__.py	100.00% <100.00%> (ø)
diffsptk/core/ap.py	100.00% <100.00%> (ø)
diffsptk/core/excite.py	100.00% <100.00%> (ø)
diffsptk/core/gmm.py	100.00% <100.00%> (ø)
diffsptk/core/grpdelay.py	100.00% <100.00%> (ø)
diffsptk/core/levdur.py	100.00% <100.00%> (ø)
diffsptk/core/linear_intpl.py	100.00% <100.00%> (ø)
diffsptk/core/lpc.py	100.00% <100.00%> (ø)
diffsptk/core/mgc2mgc.py	100.00% <100.00%> (ø)
... and 9 more

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