Update readme for new trust mechnisms
Update readme for new trust mechnisms

Signed-off-by: Tycho Andersen <10c18fcb898ee6b17d6575d444b125d10b3f4d6a@canonical.com>

dustinkirkland/lxd,Skarlso/lxd,hallyn/lxd,techtonik/lxd,basvanbeek/lxd,dustinkirkland/lxd,techtonik/lxd,sl1pm4t/lxd,beni55/lxd,stgraber/lxd,stgraber/lxd,hallyn/lxd,rrva/lxd,jumpstarter-io/lxd,smoser/lxd,lxc/lxd,ollie314/lxd,jensg-st/lxd,georghopp/lxd,akshaykarle/lxd,hallyn/lxd,stgraber/lxd,achanda/lxd,beni55/lxd,stgraber/lxd,erikmack/lxd,dustinkirkland/lxd,dvbportal/osx-lxd,akshaykarle/lxd,stgraber/lxd,jsavikko/lxd,techtonik/lxd,dvbportal/osx-lxd,benaryorg/lxd,atxwebs/lxd,beni55/lxd,erikmack/lxd,chrisglass/lxd,achanda/lxd,hallyn/lxd,Skarlso/lxd,chrisglass/lxd,yura-pakhuchiy/lxd,rcj4747/lxd,pcdummy/lxd,rcj4747/lxd,hallyn/lxd,achanda/lxd,erikmack/lxd,dvbportal/osx-lxd,lxc/lxd,ericsnowcurrently/lxd,mikemccracken/lxd,mjeanson/lxd,rcj4747/lxd,ollie314/lxd,Malizor/lxd,jumpstarter-io/lxd,atxwebs/lxd,benaryorg/lxd,stgraber/lxd,Skarlso/lxd,pcdummy/lxd,ericsnowcurrently/lxd,mikemccracken/lxd,mikemccracken/lxd,Malizor/lxd,tych0/lxd,chrisglass/lxd,Skarlso/lxd,jumpstarter-io/lxd,lxc/lxd,rrva/lxd,mjeanson/lxd,basvanbeek/lxd,smoser/lxd,rrva/lxd,lxc/lxd,pcdummy/lxd,jensg-st/lxd,akshaykarle/lxd,mjeanson/lxd,lxc/lxd,sl1pm4t/lxd,sl1pm4t/lxd,atxwebs/lxd,georghopp/lxd,atxwebs/lxd,georghopp/lxd,stgraber/lxd,lxc/lxd,yura-pakhuchiy/lxd,jsavikko/lxd,lxc/lxd,basvanbeek/lxd,hallyn/lxd,yura-pakhuchiy/lxd,jensg-st/lxd,benaryorg/lxd,tych0/lxd,smoser/lxd,ericsnowcurrently/lxd,tych0/lxd,jsavikko/lxd,ollie314/lxd,Malizor/lxd