Accessing postgres created with `convox resources create ...` through CLI

[ddollar]

To work with rack level resource you now use the convox rack resources ... CLI namespace.

See these for more details:

[20190115161630] Rack Resources Namespace

This release moves existing convox resources cli commands to the convox rack resources namespace and adds new convox resources for app-level resources: convox resources -a <app> convox resources info <resource> -a <app> convox resources proxy <resource> -a <app> convox resources url <resource> -a <app> #3068 separate rack and app level resources [@ddollar] #3071 add encrypted option to app-level databases [@ddollar] #3072 expose internal router host if set [@ddollar]

https://docs.convox.com/gen1/resources