Remove upper bounds for req.
Remove upper bounds for req.

Please see fpco/stackage/issues/2196#issuecomment-271468491.

fpco/stackage,mrkkrp/stackage,lwm/stackage,iand675/stackage,fimad/stackage,phadej/stackage,asr/stackage,athanclark/stackage,jonschoning/stackage,alanz/stackage,judah/stackage,int-index/stackage,soenkehahn/stackage,christiaanb/stackage,stackbuilders/stackage,phaazon/stackage,Daniel-Diaz/stackage,peti/stackage,mgajda/stackage,clinty/stackage,mstksg/stackage,spencerjanssen/stackage,ygale/stackage,garetxe/stackage,k0ral/stackage,wereHamster/stackage,massysett/stackage,DanielG/stackage,simonmichael/stackage,michalkonecny/stackage,creichert/stackage,Shimuuar/stackage,ethercrow/stackage,GregorySchwartz/stackage