Toggle features with a boolean

I had a need to toggle a feature based on a boolean, and rather than write an if statement to send activate or deactivate, it would be nice if the Rollout object had a method that set the state with a boolean.
@JohnBaku That doesn't resolve @justincampbell's issue. Accepting a boolean allows us to skip the step of evaluating what we need to call. That's:
```
$feature.set(:chat, MyChatSystem.is_on?)
```

vs.

```
if MyChatSystem.is_on?
  $feature.set(:chat, :on)
else
  $feature.set(:chat, :off)
end
```

@justincampbell Is this correct or am I misunderstanding?