Update version and changelog for 2.9.0 beta release.

Signed-off-by: Ivan Sein <ivan@nextcloud.com>

CHANGELOG.md

@@ -1,6 +1,10 @@
 # Changelog
 All notable changes to this project will be documented in this file.
 
+## 2.9.0 – 2017-12-12
+### Beta release
+ - Beta release of Nextcloud 13 features for early testers.
+
 ## 2.0.2 – 2017-11-28
 ### Fixed
  - Re-send data channels messages when they could not be sent.

appinfo/info.xml

@@ -18,7 +18,7 @@ And in the works for the [coming versions](https://github.com/nextcloud/spreed/m
 
 	]]></description>
 
-	<version>2.1.10</version>
+	<version>2.9.0</version>
 	<licence>agpl</licence>
 
 	<author>Ivan Sein</author>