Fix read only field mapping bug
Fix read only field mapping bug

mjalil/AutoMapper,iaingalloway/AutoMapper,kisflying/AutoMapper,gentledepp/AutoMapper,ssalaberry/AutoMapper,AutoMapper/AutoMapper,GeertVL/AutoMapper,EricSB/AutoMapper,dparra0007/AutoMapper,TylerCarlson1/AutoMapper,wilbit/AutoMapper,jbogard/AutoMapper,sh-sabooni/AutoMapper,michaelkauflin/AutoMapper,CandidoCleyton/AutoMapper,jnm2/AutoMapper,mwpowellhtx/MicroMapper,BlaiseD/AutoMapper,lbargaoanu/AutoMapper,seanlin816/AutoMapper,jasonholloway/AutoMapper,AutoMapper/AutoMapper,briangweber/AutoMapper