[add]change log.

CHANGELOG.md

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+# Change Log
+
+## 2.0.x
+Released on 2016-8
+
+#### Added
+- Migrate UIImage cache category to new SKCache
+
+#### Fixed
+- Make cached response data return optional
+- Fixed issue when animatedFromView not has a superview but has superlayer
+- Fixed when image downloaded then not show activityindicator
+
+--- 
+
+## 1.9.x
+Released on 2016-6
+
+#### Added
+- Delegate to notify when the user scroll to an index
+- Single tap to dismiss
+
+#### Fixed
+- Fixed a bug where the activity indicator was only visible
+- Fixed unit test and problems running when being bridged
+
+---
+
+## 1.8.x
+Released on 2016-4
+
+#### Added
+- Using SKPhotoProtocol to enable usage from SKLocalPhoto 
+- SKLocalPhoto to support local photo from file
+
+#### Fixed
+- Bug when animation when tap.
+- The indicator may not disappear when loading local image
+- Event crash when closing before image has been loaded
+- Fix crash on initialisation
+
+---
+
+## 1.7.x
+Released on 2016-3
+
+#### Added
+- Enable ability to override statusBar style
+
+#### Fixed
+- Update for swift2.0
+- Bug when zooming small image
+- Prevent crash when closing before image has been loaded
+
+---
+
+## 1.6.x
+Released on 2016-3
+
+#### Fixed
+- Change maxScale to 1.0 it works perfectly.
+- Fixed the bug which was after the device rotation
+
+---
+
+## 1.5.x
+Released on 2016-3
+
+#### Added
+- Delete Button
+
+#### Fixed
+- Change maxScale to 1.0 it works perfectly.
+- Rew algorithm for maxScale.
+- Changed UIActionSheet to UIAlertController with ActionSheet style
+
+---
+
+## 1.4.x
+Released on 2016-2
+
+#### Added
+- Delegate add for actionbutton.
+- DidShowPhotoAtIndex delegate goes to optional. 
+
+#### Fixed
+- Zooming bug fixed.
+
+---
+
+## 1.3.x
+Released on 2016-1
+
+#### Added
+- Added action functionality similar to IDMPhotoBrowser.
+- Add extra caption for share
+
+#### Fixed
+- Bug fixed for mail crash
+
+
+--- 
+
+## 1.2.x
+Released on 2015-10
+
+#### Added
+- SKPhotoProtocol is implemented.
+
+#### Fixed
+- Double tap bug fixed
+
+---
+
+## 1.1.x
+Released on 2015-10-09.
+
+#### Fixed
+- some property make private.
+- layout bug fixed when zoom.
+
+## 1.0.0
+Released on 2015-10-09.
+
+#### Added
+- Tests for upload and download with progress.
+  - Added by [Mattt Thompson](https://github.com/mattt).
+- Test for question marks in url encoded query.
+  - Added by [Mattt Thompson](https://github.com/mattt).
+- The `NSURLSessionConfiguration` headers to `cURL` representation.
+  - Added by [Matthias Ryne Cheow](https://github.com/rynecheow) in Pull Request
+  [#140](https://github.com/Alamofire/Alamofire/pull/140).
+- Parameter encoding tests for key/value pairs containing spaces.
+  - Added by [Mattt Thompson](https://github.com/mattt).
+- Percent character encoding for the `+` character.
+  - Added by [Niels van Hoorn](https://github.com/nvh) in Pull Request
+  [#167](https://github.com/Alamofire/Alamofire/pull/167).
+- Escaping for quotes to support JSON in `cURL` commands.
+  - Added by [John Gibb](https://github.com/johngibb) in Pull Request
+  [#178](https://github.com/Alamofire/Alamofire/pull/178).
+- The `request` method to the `Manager` bringing it more inline with the top-level methods.
+  - Added by Brian Smith.