[FIX] Simplify snr_spectrum()

[nbara]

No description provided.

[codecov]

Codecov Report

Merging #14 into master will decrease coverage by 0.06%.
The diff coverage is 78.57%.

@@            Coverage Diff             @@
##           master      #14      +/-   ##
==========================================
- Coverage   70.88%   70.82%   -0.07%     
==========================================
  Files          16       16              
  Lines        1865     1868       +3     
==========================================
+ Hits         1322     1323       +1     
- Misses        543      545       +2     

Impacted Files	Coverage Δ
meegkit/utils/base.py	72.72% <62.50%> (-12.99%)	⬇️
meegkit/utils/stats.py	39.71% <100.00%> (-0.43%)	⬇️

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