Deprecate observe(_:during:).

Author: andersio

Sources/Property.swift

@@ -38,6 +38,7 @@ extension PropertyProtocol {
 	///   - observer: An observer to send the events to.
 	///   - lifetime: A lifetime of the observing object.
 	@discardableResult
+	@available(*, deprecated, message:"Use `take(during:)` and `start` on the property producer instead. `observe(_:during:)` would be removed in ReactiveSwift 2.0.")
 	public func observe(_ observer: Observer<Value, NoError>, during lifetime: Lifetime) -> Disposable? {
 		return producer.observe(observer, during: lifetime)
 	}

Sources/UnidirectionalBinding.swift

@@ -23,13 +23,15 @@ public protocol BindingSource {
 
 extension Signal: BindingSource {
 	@discardableResult
+	@available(*, deprecated, message:"Use `take(during:)` and `observe` instead. `observe(_:during:)` would be removed in ReactiveSwift 2.0.")
 	public func observe(_ observer: Observer, during lifetime: Lifetime) -> Disposable? {
 		return self.take(during: lifetime).observe(observer)
 	}
 }
 
 extension SignalProducer: BindingSource {
 	@discardableResult
+	@available(*, deprecated, message:"Use `take(during:)` and `start` instead. `observe(_:during:)` would be removed in ReactiveSwift 2.0.")
 	public func observe(_ observer: ProducedSignal.Observer, during lifetime: Lifetime) -> Disposable? {
 		var disposable: Disposable!