MAINT be more inclusive regarding dict

[glemaitre]

dict can be too restrictive since check_sampling_strategy is returning OrderedDict.

[codecov]

Codecov Report

Base: 96.15% // Head: 96.15% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (15592a3) compared to base (628f4a4).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #958   +/-   ##
=======================================
  Coverage   96.15%   96.15%           
=======================================
  Files          99       99           
  Lines        6892     6894    +2     
  Branches      994      994           
=======================================
+ Hits         6627     6629    +2     
  Misses        163      163           
  Partials      102      102           

Impacted Files	Coverage Δ
imblearn/over_sampling/base.py	100.00% <100.00%> (ø)
imblearn/under_sampling/base.py	100.00% <100.00%> (ø)

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