Update CHANGELOG for 2.6

Author: garrettmoon

CHANGELOG.md

@@ -1,5 +1,8 @@
 ## master
 * Add your own contributions to the next release on the line below this with your name.
+
+## 2.6
+- [Xcode 9] Updated to require Xcode 9 (to fix warnings) [Garrett Moon](https://github.com/garrettmoon)
 - [ASCollectionView] Improve performance and behavior of rotation / bounds changes. [Scott Goodson](https://github.com/appleguy) [#431](https://github.com/TextureGroup/Texture/pull/431)
 - [ASCollectionView] Improve index space translation of Flow Layout Delegate methods. [Scott Goodson](https://github.com/appleguy)
 - [Animated Image] Adds support for animated WebP as well as improves GIF handling. [#605](https://github.com/TextureGroup/Texture/pull/605) [Garrett Moon](https://github.com/garrettmoon)
@@ -10,9 +13,6 @@
 - [API CHANGES] `ASPerformMainThreadDeallocation` and `ASPerformBackgroundDeallocation` functions take `id *` instead of `id` and they're now more reliable. Also, in Swift, `ASDeallocQueue.sharedDeallocationQueue() -> ASDeallocQueue.sharedDeallocationQueue`. [Adlai Holler](https://github.com/Adlai-Holler) [#651](https://github.com/TextureGroup/Texture/pull/651)
 - [Collection/Table] Added direct support for mapping section indexes between data spaces. [Adlai Holler](https://github.com/Adlai-Holler) [#651](https://github.com/TextureGroup/Texture/pull/660)
 
-## 2.6
-- [Xcode 9] Updated to require Xcode 9 (to fix warnings) [Garrett Moon](https://github.com/garrettmoon)
-
 ## 2.5.1
 - [ASVideoNode] Fix unreleased time observer. [Flo Vouin](https://github.com/flovouin)
 - [PINCache] Set a default .byteLimit to reduce disk usage and startup time. [#595](https://github.com/TextureGroup/Texture/pull/595) [Scott Goodson](https://github.com/appleguy)