avoid redundant Auth.write_credentials
avoid redundant Auth.write_credentials

reduces overhead of heroku-accounts shim when default is already setup in netrc

greeca0204/heroku,uhoh-itsmaciek/heroku,heroku/heroku,macedo/heroku,Faisalawanisee/heroku,vcgato29/heroku,vcgato29/heroku,rkh/heroku,dickeyxxx/heroku,vcgato29/heroku,greeca0204/heroku,dickeyxxx/heroku,duypq94/heroku,gregburek/heroku,macedo/heroku,rkh/heroku,gregburek/heroku,dickeyxxx/heroku,sancopanco/heroku,heroku/heroku,macedo/heroku,greeca0204/heroku,Faisalawanisee/heroku,uhoh-itsmaciek/heroku,gregburek/heroku,Faisalawanisee/heroku,sancopanco/heroku,rkh/heroku,sancopanco/heroku,heroku/heroku,duypq94/heroku,duypq94/heroku