fix packages.json upload instructions not printing when invoked with tty stdout
fix packages.json upload instructions not printing when invoked with tty stdout

alzheic/heroku-buildpack-aop,emeth-/heroku-buildpack-php,flant/heroku-buildpack-php,createmultimedia/heroku-buildpack-php,rs-makino/buildpack-test,dzuelke/heroku-buildpack-php,emeth-/heroku-buildpack-php,rikur/heroku-buildpack-php,heroku/heroku-buildpack-php,jopereyral/heroku-buildpack-php,rs-makino/buildpack-test,alzheic/heroku-buildpack-aop,jayelkaake/heroku-buildpack-magento,a2service/heroku-buildpack-php,puteulanus/heroku-buildpack-php,rs-makino/buildpack-test,rs-makino/buildpack-test,rikur/heroku-buildpack-php,jopereyral/heroku-buildpack-php,alzheic/heroku-buildpack-aop,flant/heroku-buildpack-php,dzuelke/heroku-buildpack-php,emeth-/heroku-buildpack-php,emeth-/heroku-buildpack-php,thecsea/heroku-buildpack-php-with-ioncube,0ppy/sample-buildpack,rs-makino/buildpack-test,jopereyral/heroku-buildpack-php,heroku/heroku-buildpack-php,flant/heroku-buildpack-php,jayelkaake/heroku-buildpack-magento,0ppy/sample-buildpack,puteulanus/heroku-buildpack-php,martijngastkemper/heroku-buildpack-php,heroku/heroku-buildpack-php,heroku/heroku-buildpack-php,rikur/heroku-buildpack-php,rikur/heroku-buildpack-php,a2service/heroku-buildpack-php,puteulanus/heroku-buildpack-php,createmultimedia/heroku-buildpack-php,a2service/heroku-buildpack-php,thecsea/heroku-buildpack-php-with-ioncube,0ppy/sample-buildpack,jayelkaake/heroku-buildpack-magento,createmultimedia/heroku-buildpack-php,dzuelke/heroku-buildpack-php,rs-makino/buildpack-test,thecsea/heroku-buildpack-php-with-ioncube,martijngastkemper/heroku-buildpack-php