[FIX] Initial conditions for Yulewalk filter

[nbara]

Fixes #10.

[codecov]

Codecov Report

Merging #15 into master will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #15      +/-   ##
==========================================
+ Coverage   71.94%   71.96%   +0.01%     
==========================================
  Files          16       16              
  Lines        1868     1869       +1     
==========================================
+ Hits         1344     1345       +1     
  Misses        524      524              

Impacted Files	Coverage Δ
meegkit/utils/asr.py	79.64% <100.00%> (+0.12%)	⬆️

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