Bump version and changelog

CHANGES.rst

-Changes in synapse v0.18.0-rc1 (2016-09-16)
-===========================================
+Changes in synapse v0.18.0 (2016-09-19)
+=======================================
 
 The release includes major changes to the state storage database schemas, which
 significantly reduce database size. Synapse will attempt to upgrade the current
@@ -9,6 +9,19 @@ want to consider migrating to using Postgres before upgrading very large SQLite
 daabases
 
 
+Changes:
+
+* Make public room search case insensitive (PR #1127)
+
+
+Bug fixes:
+
+* Fix and clean up publicRooms pagination (PR #1129)
+
+
+Changes in synapse v0.18.0-rc1 (2016-09-16)
+===========================================
+
 Features:
 
 * Add ``only=highlight`` on ``/notifications`` (PR #1081)

synapse/__init__.py

@@ -16,4 +16,4 @@
 """ This is a reference implementation of a Matrix home server.
 """
 
-__version__ = "0.18.0-rc1"
+__version__ = "0.18.0"