FIX remove smoothed_bootstrap and use only shrinkage param

[glemaitre]

closes #792

Remove the smoothed_bootstrap param and only keep shrinkage to control the bootstrapping.

[pep8speaks]

Hello @glemaitre! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file examples/over-sampling/plot_shrinkage_effect.py:

Line 19:1: E402 module level import not at top of file
Line 20:1: E402 module level import not at top of file
Line 33:1: E402 module level import not at top of file
Line 46:1: E402 module level import not at top of file

Comment last updated at 2021-02-12 14:19:56 UTC

[glemaitre]

ping @chkoar Is it what you had in mind?

[codecov]

Codecov Report

Merging #794 (c921eb7) into master (3444430) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #794      +/-   ##
==========================================
+ Coverage   98.55%   98.57%   +0.01%     
==========================================
  Files          87       87              
  Lines        5737     5740       +3     
  Branches      481      484       +3     
==========================================
+ Hits         5654     5658       +4     
+ Misses         82       81       -1     
  Partials        1        1              

Impacted Files	Coverage Δ
imblearn/over_sampling/_random_over_sampler.py	100.00% <100.00%> (+1.49%)	⬆️
...rn/over_sampling/tests/test_random_over_sampler.py	100.00% <100.00%> (ø)

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[glemaitre]

@chkoar Is fine with you like this?

[chkoar]

@chkoar Is fine with you like this?

I think yes.