Update guide for Phoenix 1.3
Update guide for Phoenix 1.3

jwarwick/phoenix,eksperimental/phoenix,mitchellhenke/phoenix,Joe-noh/phoenix,mobileoverlord/phoenix,dmarkow/phoenix,michalmuskala/phoenix,phoenixframework/phoenix,0x00evil/phoenix,nshafer/phoenix,Gazler/phoenix,gjaldon/phoenix,dmarkow/phoenix,Joe-noh/phoenix,phoenixframework/phoenix,keathley/phoenix,mschae/phoenix,keathley/phoenix,stevedomin/phoenix,optikfluffel/phoenix,nshafer/phoenix,evax/phoenix,mschae/phoenix,optikfluffel/phoenix,0x00evil/phoenix,rafbgarcia/phoenix,korobkov/phoenix,bsmr-erlang/phoenix,phoenixframework/phoenix,nshafer/phoenix,korobkov/phoenix,trarbr/phoenix,rafbgarcia/phoenix,evax/phoenix,stevedomin/phoenix,pap/phoenix,bsmr-erlang/phoenix,michalmuskala/phoenix,eksperimental/phoenix,mobileoverlord/phoenix,Kosmas/phoenix,trarbr/phoenix,optikfluffel/phoenix,jwarwick/phoenix,0x00evil/phoenix,rafbgarcia/phoenix,pap/phoenix,mitchellhenke/phoenix,Gazler/phoenix,gjaldon/phoenix,Kosmas/phoenix