Heroku: Heroku renamed the included-spec fields for Postgres Premium-9 from disk_size and connection_limit to disk and connecti…

{"ram":"768 GB","disk_size":"4 TB","connection_limit":"500"} → {"ram":"768 GB","disk":"4 TB","connections":"500"}

Heroku renamed the included-spec fields for Postgres Premium-9 from disk_size and connection_limit to disk and connections. The values were unchanged at 768 GB RAM, 4 TB disk and 500 connections.