[docs] suggest to upgrade pip and setuptools
[docs] suggest to upgrade pip and setuptools

zhouyao1994/incubator-superset,apache/incubator-superset,airbnb/caravel,BRD-CD/superset,apache/incubator-superset,timifasubaa/incubator-superset,BRD-CD/superset,alanmcruickshank/superset-dev,FrederichCheng/incubator-superset,jeromecn/caravel_viz_full,timifasubaa/incubator-superset,ArijanaBrlek/superset,nekia/incubator-superset-dev,apache/incubator-superset,ArijanaBrlek/superset,asdf2014/superset,alanmcruickshank/superset-dev,mistercrunch/panoramix,massgov/incubator-superset,dmigo/incubator-superset,jeromecn/caravel_viz_full,SingTel-DataCo/incubator-superset,SingTel-DataCo/incubator-superset,ArijanaBrlek/superset,BRD-CD/superset,zhouyao1994/incubator-superset,zhouyao1994/incubator-superset,mistercrunch/panoramix,apache/incubator-superset,alanmcruickshank/superset-dev,airbnb/caravel,alanmcruickshank/superset-dev,airbnb/superset,dmigo/incubator-superset,robert-digit/superset,FrederichCheng/incubator-superset,SingTel-DataCo/incubator-superset,massgov/incubator-superset,airbnb/caravel,FrederichCheng/incubator-superset,airbnb/caravel,ArijanaBrlek/superset,nekia/incubator-superset-dev,nekia/incubator-superset-dev,dmigo/incubator-superset,BRD-CD/superset,airbnb/superset,robert-digit/superset,massgov/incubator-superset,airbnb/superset,zhouyao1994/incubator-superset,massgov/incubator-superset,robert-digit/superset,SingTel-DataCo/incubator-superset,asdf2014/superset,asdf2014/superset,timifasubaa/incubator-superset,nekia/incubator-superset-dev,mistercrunch/panoramix,dmigo/incubator-superset,FrederichCheng/incubator-superset,timifasubaa/incubator-superset,asdf2014/superset,apache/incubator-superset,robert-digit/superset,zhouyao1994/incubator-superset,airbnb/superset,mistercrunch/panoramix,jeromecn/caravel_viz_full,jeromecn/caravel_viz_full