use heroku addons:create
use heroku addons:create

heroku addons:add is deprecated, replace with heroku addons:create
hexsprite/meteor-buildpack-horse,dalloro/meteor-buildpack-pony,jad11v/meteor-buildpack-horse,sabon/great-balls-of-fire,domo-lab/meteor-buildpack-horse,lirbank/meteor-buildpack-horse,vmtung/heroku-meteor-buildpack,RocketChat/heroku-buildpack-meteor,dheerajbhaskar/meteor-buildpack-horse-without-mongolab,okgrow/meteor-buildpack-horse,spozi/meteor-buildpack-horse,tdenovan/meteor-buildpack-horse,stepri/meteor-buildpack-horse,rolltapeinc/meteor-buildpack-horse,makalu/meteor-buildpack-horse,Alveoli/meteor-buildpack-horse,AdmitHub/meteor-buildpack-horse,sabon/great-balls-of-fire,tab00/prebuiltdeploy,emadurandal/meteor-buildpack-horse,smartphoneorchestra/heroku-buildpack-meteor-ffmpeg-lame,forwarder/meteor-buildpack-horse,dashersw/meteor-buildpack-horse,webantic/meteor-buildpack-horse,simonv3/meteor-buildpack-horse,eJugnoo/meteor-buildpack-horses,sabon/great-balls-of-fire