Merge branch 'master' into develop

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diff --git a/CHANGES.rst b/CHANGES.rst

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--- a/CHANGES.rst
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+Changes in synapse v0.31.2 (2018-06-14)
+=======================================
+
+SECURITY UPDATE: Prevent unauthorised users from setting state events in a room
+when there is no ``m.room.power_levels`` event in force in the room. (PR #3397)
+
+Discussion around the Matrix Spec change proposal for this change can be
+followed at https://github.com/matrix-org/matrix-doc/issues/1304.
+
 Changes in synapse v0.31.1 (2018-06-08)
 =======================================