Update app.json
Update app.json

This is no longer needed as we now officially support Go: https://blog.heroku.com/archives/2015/7/7/go_support_now_official_on_heroku
niiyz/pgweb,xiongjungit/pgweb,akarki15/pgweb,sosedoff/pgweb,adamjaso/pgweb,hardware/pgweb,adamjaso/pgweb,w4ngyi/pgweb,sosedoff/pgweb,niiyz/pgweb,beni55/pgweb,beni55/pgweb,w4ngyi/pgweb,daveallie/pgweb,niiyz/pgweb,trigrass2/pgweb,xiongjungit/pgweb,adamjaso/pgweb,akarki15/pgweb,daveallie/pgweb,w4ngyi/pgweb,trigrass2/pgweb,daveallie/pgweb,beni55/pgweb,sosedoff/pgweb,daveallie/pgweb,beni55/pgweb,hardware/pgweb,xiongjungit/pgweb,sosedoff/pgweb,akarki15/pgweb,trigrass2/pgweb,trigrass2/pgweb,akarki15/pgweb,hardware/pgweb,xiongjungit/pgweb,adamjaso/pgweb,niiyz/pgweb,w4ngyi/pgweb,hardware/pgweb