Prepare changelog for v0.13.2

Author: dbkr

CHANGELOG.md

@@ -1,3 +1,10 @@
+Changes in [0.13.2](https://github.com/matrix-org/matrix-react-sdk/releases/tag/v0.13.2) (2018-08-23)
+=====================================================================================================
+[Full Changelog](https://github.com/matrix-org/matrix-react-sdk/compare/v0.13.1...v0.13.2)
+
+ * Don't crash if the value of a room tag is null
+   [\#2135](https://github.com/matrix-org/matrix-react-sdk/pull/2135)
+
 Changes in [0.13.1](https://github.com/matrix-org/matrix-react-sdk/releases/tag/v0.13.1) (2018-08-20)
 =====================================================================================================
 [Full Changelog](https://github.com/matrix-org/matrix-react-sdk/compare/v0.13.1-rc.1...v0.13.1)