Removed squaring in ndPAC: values are now normalized [0, 1]

[raphaelvallat]

See #8

[codecov]

Codecov Report

Merging #9 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master       #9   +/-   ##
=======================================
  Coverage   91.27%   91.28%           
=======================================
  Files          14       14           
  Lines        1066     1067    +1     
  Branches      159      159           
=======================================
+ Hits          973      974    +1     
  Misses         48       48           
  Partials       45       45           

Impacted Files	Coverage Δ
tensorpac/methods/meth_pac.py	100.00% <100.00%> (ø)

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[EtienneCmb]

Thanks @raphaelvallat,

Good idea of improving the doc of the ps. However, this is not the phase of the high-frequency that is required, but the phase of the amplitude of the high-frequency. Can you make the changes? And for the input arguments, I propose pha and pha_amp

[raphaelvallat]

Just made the changes!

[EtienneCmb]

Parfait chef ! Merci !

Closes #3