Re-export HugoCmd
Re-export HugoCmd

Caddy depends on it.

Fixes #1827

bogem/hugo,fedelibre/hugo,jygastaud/hugo,digitalcraftsman/hugo,ffrizzo/hugo,abourget/hugo,gohugoio/hugo,vbatoufflet/hugo,anthonyfok/hugo,mayah/hugo,fedelibre/hugo,Zenithar/hugo,MarkDBlackwell/hugo,mdhender/hugo,derekperkins/hugo,Zenithar/hugo,jygastaud/hugo,fedelibre/hugo,melo/hugo,tischda/hugo,mdhender/hugo,sprig/hugo,gohugoio/hugo,bogem/hugo,derekperkins/hugo,mitchchn/hugo,fedelibre/hugo,soundrussian/hugo,MarkDBlackwell/hugo,vbatoufflet/hugo,mayah/hugo,anthonyfok/hugo,coderzh/hugo,soundrussian/hugo,coderzh/hugo,abourget/hugo,mdhender/hugo,mdhender/hugo,ifraixedes/hugo,ifraixedes/hugo,anthonyfok/hugo,mitchchn/hugo,tubo028/hugo,digitalcraftsman/hugo,tubo028/hugo,ffrizzo/hugo,melo/hugo,tischda/hugo,sprig/hugo,gohugoio/hugo