[WIP] CI update conda build and check doc

[glemaitre]

Reference Issue

closes #333

What does this implement/fix? Explain your changes.

Any other comments?

[codecov]

Codecov Report

Merging #334 into master will decrease coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #334      +/-   ##
==========================================
- Coverage    98.6%   98.55%   -0.06%     
==========================================
  Files          68       68              
  Lines        3948     3948              
==========================================
- Hits         3893     3891       -2     
- Misses         55       57       +2

Impacted Files	Coverage Δ
imblearn/datasets/zenodo.py	95.38% <0%> (-3.08%)	⬇️

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