DOC: mention 'category' in select_dtypes docstring
Merge pull request #8439 from bthyreau/doc_selectdtypes_categ

DOC: mention 'category' in select_dtypes docstring
BUG: NDFrame.equals gives false negatives with dtype=object (GH8437)
Merge pull request #8443 from unutbu/dtypeO-equals

BUG: NDFrame.equals gives false negatives with dtype=object (GH8437)
CI: start using conda
CI: pydata install should use develop
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