MAINT prepare release 0.9.0

[glemaitre]

Preparing the release 0.9.0

[codecov]

Codecov Report

Merging #886 (a222eab) into master (f1abf75) will decrease coverage by 3.95%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #886      +/-   ##
==========================================
- Coverage   97.21%   93.26%   -3.96%     
==========================================
  Files          96       96              
  Lines        6253     6253              
  Branches      712      712              
==========================================
- Hits         6079     5832     -247     
- Misses        103      359     +256     
+ Partials       71       62       -9     

Impacted Files	Coverage Δ
imblearn/_min_dependencies.py	100.00% <100.00%> (ø)
imblearn/ensemble/tests/test_weight_boosting.py	100.00% <100.00%> (ø)
imblearn/keras/tests/test_generator.py	7.93% <0.00%> (-92.07%)	⬇️
imblearn/tensorflow/_generator.py	34.37% <0.00%> (-65.63%)	⬇️
imblearn/tests/test_docstring_parameters.py	30.93% <0.00%> (-55.40%)	⬇️
imblearn/tensorflow/tests/test_generator.py	10.75% <0.00%> (-54.84%)	⬇️
imblearn/keras/_generator.py	47.36% <0.00%> (-47.37%)	⬇️
imblearn/base.py	94.59% <0.00%> (-4.06%)	⬇️
imblearn/ensemble/_forest.py	91.66% <0.00%> (-0.65%)	⬇️

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