[FIX][ENH] Add regularization option for ASR

[nbara]

Fixes #17

[codecov]

Codecov Report

Merging #18 (80654a6) into master (a7d98ea) will increase coverage by 2.49%.
The diff coverage is 91.01%.

@@            Coverage Diff             @@
##           master      #18      +/-   ##
==========================================
+ Coverage   72.03%   74.53%   +2.49%     
==========================================
  Files          16       18       +2     
  Lines        1874     2054     +180     
==========================================
+ Hits         1350     1531     +181     
+ Misses        524      523       -1     

Impacted Files	Coverage Δ
meegkit/utils/asr.py	95.62% <87.03%> (+15.98%)	⬆️
meegkit/asr.py	85.94% <96.87%> (ø)
meegkit/utils/covariances.py	96.02% <100.00%> (ø)
meegkit/__init__.py	100.00% <0.00%> (ø)

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