Add optparse-simple
Add optparse-simple

Dependency of `stack` (just waiting for https://github.com/sol/hpack/pull/110 to be merged and released, then `stack` can be added back).
spencerjanssen/stackage,simonmichael/stackage,iand675/stackage,jonschoning/stackage,asr/stackage,jaspervdj/stackage,fpco/stackage,massysett/stackage,michalkonecny/stackage,athanclark/stackage,christiaanb/stackage,garetxe/stackage,peti/stackage,ethercrow/stackage,brendanhay/stackage,mgajda/stackage,mrkkrp/stackage,Daniel-Diaz/stackage,l29ah/stackage,soenkehahn/stackage,DanielG/stackage,GregorySchwartz/stackage,codedmart/stackage,clinty/stackage,judah/stackage,Shimuuar/stackage,stackbuilders/stackage,phaazon/stackage,k0ral/stackage,creichert/stackage,lwm/stackage,mstksg/stackage,fimad/stackage,alanz/stackage,int-index/stackage,wereHamster/stackage,phadej/stackage,ygale/stackage