re-enable aeson-diff (#2395)
re-enable aeson-diff (#2395)

This reverts commit 908f7e5cd33326d81975628048f607e67f62093b.

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