Add nicer error for Pro commands such as `up deploys` in the OSS version

[tonyxiao]

Prerequisites

• [x] I am running the latest version. (up upgrade)
• [x] I searched to see if the issue already exists.
• [x] I inspected the verbose debug output with the -v, --verbose flag.
• [ ] Are you an Up Pro subscriber?

$ up deploys
     Error: "deploys" is invalid, must be one of:

  • production
  • staging

Then I tried

$ up deploys staging                                                                                                                                                   
     Error: unexpected staging

According to the docs, this should work. Am I missing something really obvious?

[tj]

Ah sorry up deploys, up rollback, and up env are all Pro commands, but I'll add a nicer message to make that obvious!

[tonyxiao]

Ah, that'd be super helpful for newbies. Thanks @tj