3.1 Release Candidate 1

This is the first release candidate of ReactiveSwift 3.1. It supports Swift 3.2 and Swift 4.0.

Bugfix

1. Fixed a scenario of downstream interruptions being dropped. (#577, kudos to @andersio)

   Manual interruption of time shifted producers, including delay, observe(on:), throttle, debounce and lazyMap, should discard outstanding events at best effort ASAP.

   But in ReactiveSwift 2.0 to 3.0, the manual interruption is ignored if the upstream producer has terminated. For example:

   // Completed upstream + `delay`.
   SignalProducer.empty
       .delay(10.0, on: QueueScheduler.main)
       .startWithCompleted { print("Value should have been discarded!") }
       .dispose()
   
   // Console(t+10): Value should have been discarded!

   The expected behavior has now been restored.

   Please note that, since ReactiveSwift 2.0, while the interruption is handled immediately, the interrupted event delivery is not synchronous — it generally respects the closest asynchronous operator applied, and delivers on that scheduler.

Addition

1. SignalProducer.concat now has an overload that accepts an error. (#564, kudos to @nmccann)

Change

1. Fix some documentation errors (#560, kudos to @ikesyo)