DOC:Update python version support info#27580

Merged

jreback merged 3 commits intopandas-dev:masterfrom

sameshl:doc_version_support

Aug 1, 2019

Commits on Jul 25, 2019

DOC:Update python version support info
sameshl
authored

Commits on Jul 27, 2019

remove "plan for droping Python 2.7"
sameshl
authored

Commits on Aug 1, 2019

replace all instances of ref pointing to the part of dropping Python 2.7 to the actual http link.
sameshl
committed