Unconstrain megaparsec and friends per #3159
Unconstrain megaparsec and friends per #3159

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