enable slack-web (#3460)
enable slack-web (#3460)

athanclark/stackage,jonschoning/stackage,ethercrow/stackage,fpco/stackage,asr/stackage,mstksg/stackage,creichert/stackage,stackbuilders/stackage,simonmichael/stackage,iand675/stackage,mgajda/stackage,Shimuuar/stackage,mrkkrp/stackage,soenkehahn/stackage,clinty/stackage,massysett/stackage,int-index/stackage,lwm/stackage,wereHamster/stackage,spencerjanssen/stackage,Daniel-Diaz/stackage,fimad/stackage,peti/stackage,michalkonecny/stackage