Introduce Lifetime.Token.dispose.

[andersio]

This hopefully makes attaching lifetime to producer chains more natural.

let (lifetime, token) = Lifetime.make()

let producer = SignalProducer.combineLatest(conditionA, conditionB, conditionC)
    .filter { $0 && $1 && $2 }

// Before
producer.startWithCompleted { _ = token }

// After
producer.startWithCompleted(token.dispose)

Checklist

• Updated CHANGELOG.md.

[mdiep]

This should say dispose(), not terminate().

[mdiep]

I like it. 👍 👍

This should be a lot clearer for most people.