Updated README instructions
Updated README instructions

Points to the LXC PPA instead.

Signed-off-by: Chris Glass <a701886c447b341a3801be16a190c3b857871812@canonical.com>

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