Update composer.json with Dokku specific stuff
Update composer.json with Dokku specific stuff

gm-ah/Cachet,whealmedia/Cachet,NossaJureg/Cachet,wakermahmud/Cachet,CloudA/Cachet,Mebus/Cachet,eduardocruz/Cachet,cachethq/Cachet,elektropay/Cachet,rogerapras/Cachet,h3zjp/Cachet,leegeng/Cachet,g-forks/Cachet,withings-sas/Cachet,cachethq/Cachet,eduardocruz/Cachet,MatheusRV/Cachet-Sandstorm,pellaeon/Cachet,SamuelMoraesF/Cachet,elektropay/Cachet,clbn/Cachet,MicroWorldwide/Cachet,0x73/Cachet,ZengineChris/Cachet,wngravette/Cachet,MatheusRV/Cachet-Sandstorm,n0mer/Cachet,anujaprasad/Hihat,sapk/Cachet,chaseconey/Cachet,alobintechnologies/Cachet,eduardocruz/Cachet,wngravette/Cachet,ephillipe/Cachet,CloudA/Cachet,brianjking/openshift-cachet,ZengineChris/Cachet,clbn/Cachet,katzien/Cachet,withings-sas/Cachet,brianjking/openshift-cachet,Surventrix/Cachet,nxtreaming/Cachet,rogerapras/Cachet,anujaprasad/Hihat,n0mer/Cachet,brianjking/openshift-cachet,bthiago/Cachet,billmn/Cachet,wakermahmud/Cachet,whealmedia/Cachet,coupej/Cachet,ematthews/Cachet,Surventrix/Cachet,Mebus/Cachet,MatheusRV/Cachet-Sandstorm,displayn/Cachet,murendie/Cachet,nxtreaming/Cachet,ematthews/Cachet,coreation/Cachet,SamuelMoraesF/Cachet,gm-ah/Cachet,karaktaka/Cachet,coupej/Cachet,anujaprasad/Hihat,katzien/Cachet,g-forks/Cachet,chaseconey/Cachet,pellaeon/Cachet,NossaJureg/Cachet,alobintechnologies/Cachet,ephillipe/Cachet,MatheusRV/Cachet-Sandstorm,n0mer/Cachet,SamuelMoraesF/Cachet,0x73/Cachet,ZengineChris/Cachet,MicroWorldwide/Cachet,h3zjp/Cachet,coupej/Cachet,karaktaka/Cachet,everpay/Cachet,displayn/Cachet,elektropay/Cachet,karaktaka/Cachet,sapk/Cachet,robglas/Cachet,leegeng/Cachet,billmn/Cachet,NossaJureg/Cachet,murendie/Cachet,robglas/Cachet,MatheusRV/Cachet-Sandstorm,chaseconey/Cachet,murendie/Cachet,pellaeon/Cachet,everpay/Cachet,wakermahmud/Cachet,rogerapras/Cachet,g-forks/Cachet,ematthews/Cachet,coreation/Cachet,Mebus/Cachet,h3zjp/Cachet,sapk/Cachet,ephillipe/Cachet,billmn/Cachet,withings-sas/Cachet,bthiago/Cachet,bthiago/Cachet