Update CHANGELOG.md

close #56

Author: jessesquires

CHANGELOG.md

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 The changelog for `JSQCoreDataKit`. Also see the [releases](https://github.com/jessesquires/JSQCoreDataKit/releases) on GitHub.
 
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+
+2.2.0
+-----
+
+This release closes the [2.2.0 milestone](https://github.com/jessesquires/JSQCoreDataKit/issues?q=milestone%3A2.2.0).
+
+### New
+
+Added a `resetStack()` top-level function. See the [updated docs](http://www.jessesquires.com/JSQCoreDataKit/Functions.html#/s:F14JSQCoreDataKit10resetStackFTCS_13CoreDataStack5queuePSo17OS_dispatch_queue_10completionFT6resultOS_19CoreDataStackResult_T__T_) for details. Thanks @marius-serban! :tada: 
+
+### Changes
+
+:warning: `CoreDataStackFactory.CompletionHandler` was moved from the factory's scope to the module's scope and renamed to `StackResultClosure`. This is *technically* a breaking change, but it is *highly* unlikely that anyone was referring to this closure directly. If so, simply rename to the correct type.
+
+2.1.0
+-----
+
+`JSQCoreDataKit` now "officially" supports all Apple platforms: iOS, OSX, tvOS, watchOS. :tada: 
+
+:trophy: [2.1.0 milestone](https://github.com/jessesquires/JSQCoreDataKit/issues?q=milestone%3A2.1.0)
+
+2.0.0
+-----
+
+### :tada: `JSQCoreDataKit` 2.0 is here! :tada: 
+
+![img](http://assets9.pop-buzz.com/2015/36/tim-cook---the-only-thing-thats-changed-is-everything--1441882553-responsive-large-0.jpg)
+
+### Breaking changes
+
+- Swift 2.0
+
+- You must now initialize `CoreDataStack` via a `CoreDataStackFactory`. This will init the stack on a background queue and return to your completion handler on the main queue when finished. This is necessary since adding a persistent store can take an unknown amount of time.
+
+- Rethinking and rewriting of [`CoreDataStack`](http://www.jessesquires.com/JSQCoreDataKit/Classes/CoreDataStack.html). It now has a `mainContext` and a `backgroundContext`. :sunglasses: 
+
+- [Saving](http://www.jessesquires.com/JSQCoreDataKit/Functions.html#/s:F14JSQCoreDataKit11saveContextFTCSo22NSManagedObjectContext4waitSb10completionGSqFOS_18CoreDataSaveResultT___T_) a context now returns a [`CoreDataSaveResult`](http://www.jessesquires.com/JSQCoreDataKit/Enums/CoreDataSaveResult.html) to the completion handler, instead of `NSError?`
+
+### New
+
+- New [`CoreDataStackFactory`](http://www.jessesquires.com/JSQCoreDataKit/Structs/CoreDataStackFactory.html) for async stack initialization, as mentioned above. It also support synchronous init if you need it, but this is only recommended for testing. Returns a [`CoreDataStackResult`](http://www.jessesquires.com/JSQCoreDataKit/Enums/CoreDataStackResult.html).
+
+- All types now conform to `CustomStringConvertible` and `Equatable`. :facepunch: 
+
+### Issues closed
+
+Find the complete list of closed issues [here](https://github.com/jessesquires/JSQCoreDataKit/issues?q=milestone%3A2.0.0). :bug: 
+
+### Documentation
+
+All [documentation](http://www.jessesquires.com/JSQCoreDataKit/) has been updated. :scroll: 
+
+## Example app
+
+The [example app](https://github.com/jessesquires/JSQCoreDataKit/tree/develop/ExampleApp) is actually an example app now, check it out! It's a pretty substantial demo.
+
+1.1.0
+-----
+
+This release closes the [1.1.0 milestone](https://github.com/jessesquires/JSQCoreDataKit/issues?q=milestone%3A%22Release+1.1.0%22).
+
+* New top-level functions
+* Ability to specify store directory other than `~/Documents/`
+* No breaking changes
+
+See the [documentation](http://www.jessesquires.com/JSQCoreDataKit/index.html) for more information!
+
+1.0.0
+-----
+
+It's here!
+
+Checkout the `README` and documentation.