DOC: fixes pipe example in basics.rst due to statsmodel changes#19923

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jorisvandenbossche merged 2 commits intopandas-dev:masterfrom

ccatalfo:pandas-19713

Feb 28, 2018

Commits on Feb 27, 2018

DOC GH19713 Change pipe example in basics.rst from poisson to ols to work around changes in statsmodel api.
ccatalfo
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Commits on Feb 28, 2018

DOC GH19713 Also update whatsnew with poisson to ols change in statsmodel pipe example.
ccatalfo
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