Added v0.9.0 to changelog

Author: louisdh

CHANGELOG.md

@@ -6,12 +6,19 @@ CHANGELOG
 
 | Contents                        |
 | :------------------------------ |
+| [0.9.0](#082-2017-08-03)        |
 | [0.8.2](#082-2017-23-02)        |
 | [0.8.1](#081-2017-21-02)        |
 | [0.8](#08-2017-20-02)           |
 
 </details>
 
+[0.9.0](https://github.com/louisdh/panelkit/tree/0.9.0) (2017-08-03)
+--------------
+* Introduced exposé with optional double 3 finger tap gesture recognizer to active.
+* Reduced public API.
+* Moved panel state properties from ```PanelContentViewController``` to ```PanelViewController```.
+
 [0.8.2](https://github.com/louisdh/panelkit/tree/0.8.2) (2017-23-02)
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