[FIX] Whitening with low amplitude data

[nbara]

Fixes #63

[codecov]

Codecov Report

Merging #64 (1ad822f) into master (70f1294) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #64   +/-   ##
=======================================
  Coverage   78.73%   78.74%           
=======================================
  Files          21       21           
  Lines        2314     2315    +1     
=======================================
+ Hits         1822     1823    +1     
  Misses        492      492           

Impacted Files	Coverage Δ
meegkit/sns.py	59.25% <ø> (ø)
meegkit/__init__.py	100.00% <100.00%> (ø)
meegkit/cca.py	74.70% <100.00%> (+0.14%)	⬆️
meegkit/utils/asr.py	95.62% <100.00%> (ø)

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more