Reenable dunai
Reenable dunai

Dunai has released version 0.5.1 which is compatible with current stackage
stackbuilders/stackage,michalkonecny/stackage,mstksg/stackage,spencerjanssen/stackage,asr/stackage,mrkkrp/stackage,massysett/stackage,mgajda/stackage,wereHamster/stackage,soenkehahn/stackage,iand675/stackage,simonmichael/stackage,ethercrow/stackage,fimad/stackage,int-index/stackage,Daniel-Diaz/stackage,peti/stackage,jonschoning/stackage,fpco/stackage,athanclark/stackage,clinty/stackage