[FIX] snr_spectrum()

[nbara]

No description provided.

[codecov]

Codecov Report

Merging #13 into master will increase coverage by 1.78%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master      #13      +/-   ##
==========================================
+ Coverage   69.09%   70.88%   +1.78%     
==========================================
  Files          16       16              
  Lines        1867     1865       -2     
==========================================
+ Hits         1290     1322      +32     
+ Misses        577      543      -34     

Impacted Files	Coverage Δ
meegkit/utils/stats.py	40.14% <66.66%> (+22.77%)	⬆️

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