0.8: New Shiny

• [UPDATED]: Minimum Swift version is now 2.3. Use 0.7 for Swift 2.2. #6

0.7: Uncle Bob

• [ADDED] Added tests around Observable. #3
• [CHANGED] Reverted API to remove EventType in favor of enforcing values. #4

0.6: Syntactical

• [CHANGED]: Refined event subscription syntax. #2

0.5: New and Old

• [ADDED]: Ability to subscribe to new and prior values. #1

0.4: Subscription Options

• [REMOVED]: Removed once subscriptions.
• [CHANGED]: Observables no longer send their initial value to new subscribers. An options argument has been added to subscribe() that allows callers to specify that they'd like to receive an initial value.

0.3: Say My Name(d Initializer Argument)

• Added a named argument to Observable.init().

0.2: Current Events

• Removed the Event type. Subscribers now just receive new and initial values.

0.1.1: Fixing My Stupid

• Make Event<T>'s properties public.

0.1: Initial Release

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