Use ModelID and SetModelID to appease golint

[penguinpowernz]

Currently the interface is:

type Model interface {
  ModelId() string
  SetModelId(string)
}

But that causes golint to whinge. The correct way according to go is:

type Model interface {
  ModelID() string
  SetModelID(string)
}

Will obviously have to manage people already using this, maybe will need to bump to v2?

[albrow]

@penguinpowernz I fixed the issue and released Version 0.19.0. Because semantic versioning allows for breaking changes before version 1.0, I elected not to bump the major version at this time. Zoom is still on version 0.x and the README is pretty clear about this and what it means.

[penguinpowernz]

Awesome dude! 👍