Added release notes for v5.3.1 (laravel#15012)

CHANGELOG.md

@@ -1,5 +1,21 @@
 # Release Notes
 
+## v5.3.1 (2016-08-24)
+
+### Changed
+- Support unversioned assets in `elixir()` function ([#14987](https://github.com/laravel/framework/pull/14987))
+- Changed visibility of `BladeCompiler::stripParentheses()` to `public` ([#14986](https://github.com/laravel/framework/pull/14986))
+- Use getter instead of accessing the properties directly in `JoinClause::__construct()` ([#14984](https://github.com/laravel/framework/pull/14984))
+- Replaced manual comparator with `asort` in `Collection::sort()` ([#14980](https://github.com/laravel/framework/pull/14980))
+- Use `query()` instead of `input()` for key lookup in `TokenGuard::getTokenForRequest()` ([#14985](https://github.com/laravel/framework/pull/14985))
+
+### Fixed
+- Check if exact key exists before assuming the dot notation represents segments in `Arr::has()` ([#14976](https://github.com/laravel/framework/pull/14976))
+- Revert aggregate changes in [#14793](https://github.com/laravel/framework/pull/14793) ([#14994](https://github.com/laravel/framework/pull/14994))
+- Prevent infinite recursion with closure based console commands ([26eaa35](https://github.com/laravel/framework/commit/26eaa35c0dbd988084e748410a31c8b01fc1993a))
+- Fixed `transaction()` method for SqlServer ([f4588f8](https://github.com/laravel/framework/commit/f4588f8851aab1129f77d87b7dc1097c842390db))
+
+
 ## v5.2.44 (2016-08-23)
 
 ### Added