Update CHANGELOG.md

Author: lukaskollmer

CHANGELOG.md

@@ -1,3 +1,24 @@
+### v0.5.0 (2017-05-07)
+- Added support for osx, watchos and tvos
+- Added `Runtime.getClass(_:)`
+- Added a `unknown(String)` case to `ObjCTypeEncoding`
+- Added `NSObject.getProperty<T>(_:)` to get a property's value
+- `ObjCTypeEncoding` how has a `struct(String)` case
+- `ObjCPropertyDescription` contains a lot more information about a property:
+  - `typeEncoding: ObjCTypeEncoding`
+  - `type: NSObject.Type`
+  - `isCopy: Bool`
+  - `isRetain: Bool`
+  - `isNonatomic: Bool`
+  - `customGetter: String?`
+  - `customSetter: String?`
+  - `isDynamic: Bool`
+  - `isWeak: Bool`
+  - `isConst: Bool`
+  - `isEligibleForGarbageCollection: Bool`
+  - `oldStyleTypeEncoding: String?`
+- `NSObject.perform(_:, _:)` now returns a wrapper so that the user can decide whether he (or she) wants to take the retained or unretained value
+
 ### v0.4.2 (2017-04-14)
 - Added `NSObject.removeAssociatedObject`: Remove a single associated object from an object
 - Added `NSObject.removeAllAssociatedObjects`: Remove all associated objects from an object