Default to `post` when body is present and no verb is specified

[bterlson]

I feel like it's fine to just use post in this case:

Playground Link

[bterlson]

Additional rationale - using get by default feels a little arbitrary too, so maybe if we like the no-verb error for body, we should have no-verb error for no-body too?

[markcowl]

pri: 2, estimate: 2