[MRG] FIX enable bootstraping in bagging

[glemaitre]

Reference Issue

closes #359

What does this implement/fix? Explain your changes.

Any other comments?

TODO:

• Correct the examples
• Check the gallery example and replace it if necessary

[codecov]

Codecov Report

Merging #360 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #360      +/-   ##
==========================================
- Coverage   98.75%   98.74%   -0.01%     
==========================================
  Files          68       68              
  Lines        3924     3899      -25     
==========================================
- Hits         3875     3850      -25     
  Misses         49       49

Impacted Files	Coverage Δ
imblearn/ensemble/tests/test_classifier.py	100% <ø> (ø)	⬆️
imblearn/ensemble/classifier.py	100% <ø> (ø)	⬆️

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