add phoenix 1.3 keynote at lonestar elixirconf (#2859)
add phoenix 1.3 keynote at lonestar elixirconf (#2859)


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