Flow 1.8.4

• Fix compilation errors in Xcode 11.4
• Use Swift.Result instead of custom result implementation
• Update sample to match readme.

Flow 1.8.3

• Fix race conditions for iOS 13 for Signal and cleanup CallbackState
• Add new combiner driven(by:) that makes a ReadSignal emit its latest readable values when the given "driver" signal fires events. The combined signal will derive its signal kind from the driver, but without write access.

Flow 1.8.2

• Fix the traitCollectionWithFallback behaviour on iOS 13 to return the view's predicted traits and prior iOS 13 to respect the key window's traits before falling back to the main screen traits.

Flow 1.8.1

• Added signal transformations contains(where:) and allSatisfy(where:) as wrappers for boolean reduce() transforms.
• Changed reduce() implementation to consider initial values when performed on readable signals.

Flow 1.8.0

• Added deallocSignal(for:) and NSObject.deallocSignal for listen on deallocation of objects.
• Added signal transformation with(weak:) as a convenience helper for breaking retain cycles.

Flow 1.7.0

• Migrate to swift 5.

Flow 1.6.0

• Addition: Make Callbacker conform to SignalProvider.

Flow 1.5.2

• Bugfix: Make sure shared() updates its last value before calling out to get correct results in case of recursion.

Flow 1.5.1

• Updates combineLatest to no longer allow mixing of plain and readable signals as for the returned signal to guarantee to be readable all provided signals must as be readable as well. This is technically a breaking of the API, but as the existing implementation is broken and might result in run-time crashes, this change can be considered as a bug-fix.

Flow 1.5.0

• Added new Future and Signal delay alternatives that accepts a closure that returns the delay based on the value allow variable delays.
• Fixed a couple of memory leaks.