Updated CHANGELOG

CHANGELOG

@@ -1,3 +1,37 @@
+Version 0.5.0 (2015-xx-xx)
+--------------------------
+Removed OCHamcrest test dependency from podfile (#211)
+Validated all public properties of all classes (#209)
+Simplified SPTracker event decoration into a single function (#204)
+Configured SPSubject to match how other Tracker Subject classes function (#203)
+Fixed SPUtils functions need to return nil not an empty string if they fail to get a value (#213)
+Fixed SPUtils getPlatform function which only returns "mob" as a default string (#205)
+Fixed RequestCallback has to import Foundation before defining protocol (#202)
+Fixed Emitter timer must be setup on main thread or it will not run (#201)
+Ensured platform is set as it is a required field for payload_data (#206)
+Ensured that sendEvents will run in background only (#197)
+Made RequestCallback protocol more idiomatic to obj-c (#189)
+Changed "POST" and "GET" options to enums (#120)
+Renamed initWithURLRequest to initWithURL (#114)
+Updated test suite to cover all code in the tracker (#208)
+Updated contexts schema to 1-0-1 (#207)
+Updated all class namespaces (#200)
+Updated payload-data to 1-0-3 (#91)
+Created SnowplowConstant class or equivalent (#35)
+Created an option to opt-out of data collection (#27)
+Added Mocking library for proper unit testing of emitter requests (#212)
+Added Tracker builder options to pass through session timeouts (#210)
+Added synchronized mutex lock to emitter results to prevent BAD_ACCESS_ERR (#216)
+Added an implementation of NSTimer without a strong reference to its parent target (#215)
+Added option to set emitting thread pool size (#199)
+Added option to set events to emit range (#198)
+Added support for checking if the device is online before attempting to emit (#184)
+Added a SnowplowSubject class equivalent to remove need to get same data over and over (#196)
+Added `is online` label to the demo app (#193)
+Added builder pattern for tracker/emitter (#190)
+Added checks for malformed NSURL (#79)
+Added in-client sessionization (#19)
+
 Version 0.4.0 (2015-08-16)
 --------------------------
 Updated how the emitter sends information to match the Android Tracker flow (#185)