MAINT: Deprecate BalanceCascade sampler

[glemaitre]

No description provided.

[pep8speaks]

Hello @glemaitre! Thanks for submitting the PR.

• There are no PEP8 issues in the file imblearn/ensemble/_balance_cascade.py !

• There are no PEP8 issues in the file imblearn/ensemble/tests/test_balance_cascade.py !

• There are no PEP8 issues in the file imblearn/tests/test_common.py !

[codecov]

Codecov Report

Merging #472 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #472      +/-   ##
==========================================
+ Coverage   98.65%   98.65%   +<.01%     
==========================================
  Files          79       79              
  Lines        4764     4769       +5     
==========================================
+ Hits         4700     4705       +5     
  Misses         64       64

Impacted Files	Coverage Δ
imblearn/ensemble/_balance_cascade.py	100% <100%> (ø)	⬆️
imblearn/tests/test_common.py	97.36% <100%> (+0.14%)	⬆️
imblearn/ensemble/tests/test_balance_cascade.py	100% <100%> (ø)	⬆️

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