Update readme with single container commands

Author: kane-c

README.md

@@ -25,21 +25,23 @@ postgres:backup-unschedule <name> Unschedules the backup of the postgres service
 postgres:clone <name> <new-name>  Create container <new-name> then copy data from <name> into <new-name>
 postgres:connect <name>           Connect via psql to a postgres service
 postgres:create <name>            Create a postgres service with environment variables
+postgres:create-database <name> <db> Create a postgres database in the specified service
 postgres:destroy <name>           Delete the service and stop its container if there are no links left
+postgres:destroy-database <name> <db> Delete a postgres database in the specified service
 postgres:enter <name> [command]   Enter or run a command in a running postgres service container
 postgres:export <name> > <file>   Export a dump of the postgres service database
 postgres:expose <name> [port]     Expose a postgres service on custom port if provided (random port otherwise)
 postgres:import <name> < <file>   Import a dump into the postgres service database
 postgres:info <name>              Print the connection information
-postgres:link <name> <app>        Link the postgres service to the app
+postgres:link <name> <app> [--user user] [--database database] Link the postgres service to the app
 postgres:list                     List all postgres services
 postgres:logs <name> [-t]         Print the most recent log(s) for this service
 postgres:promote <name> <app>     Promote service <name> as DATABASE_URL in <app>
 postgres:restart <name>           Graceful shutdown and restart of the postgres service container
 postgres:start <name>             Start a previously stopped postgres service
 postgres:stop <name>              Stop a running postgres service
 postgres:unexpose <name>          Unexpose a previously exposed postgres service
-postgres:unlink <name> <app>      Unlink the postgres service from the app
+postgres:unlink <name> <app> [--user user] [--database database] Unlink the postgres service from the app
 ```
 
 ## usage