[MRG] EHN allow to become minority in AllKNN

[glemaitre]

Sometime it could be useful to be a bit more tolerant

[glemaitre]

@massich @chkoar

[codecov]

Codecov Report

Merging #313 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #313      +/-   ##
==========================================
+ Coverage   98.32%   98.32%   +<.01%     
==========================================
  Files          68       68              
  Lines        3879     3890      +11     
==========================================
+ Hits         3814     3825      +11     
  Misses         65       65

Impacted Files	Coverage Δ
..._sampling/prototype_selection/tests/test_allknn.py	100% <100%> (ø)	⬆️
...g/prototype_selection/edited_nearest_neighbours.py	100% <100%> (ø)	⬆️

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[massich]

LGTM, I'll have to rebase.

[chkoar]

Sometime it could be useful to be a bit more tolerant

Is this a research finding or personal experience? Either way is okay.

[glemaitre]

It is something that I introduced. But reading the original paper one could force to under-sample as much as possible if he is willing too.