Capsule "dragon" and "last_update" properties
Hello,
From the documentation of v4, I see that capsules should have a `"dragon"` UUID property, and I can't see it when accessing `https://api.spacexdata.com/v4/capsules`.

I suppose that it should report the UUID of the corresponding Dragon model.

Also, let me know if you need a separate issue, but I noticed that the `"last_update"` property has some outdated values such as:
> Currently in construction for use in DM-2

when referred to capsule `5e9e2c5df359184b793b2674`.