Added alert to install redux devtool (#1228)
Added alert to install redux devtool (#1228)

* Added alert to install redux devtool

* Change to warning

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