Bump version and changelog

CHANGES.rst

+Changes in synapse v0.10.0-rc2 (2015-08-24)
+===========================================
+
+* Fix bug where we incorrectly populated the ``event_forward_extremities``
+  table, resulting in problems joining large remote rooms (e.g.
+  ``#matrix:matrix.org``)
+* Reduce the number of times we wake up pushers by not listening for presence
+  or typing events, reducing the CPU cost of each pusher.
+
+
 Changes in synapse v0.10.0-rc1 (2015-08-21)
 ===========================================
 

synapse/__init__.py

@@ -16,4 +16,4 @@
 """ This is a reference implementation of a Matrix home server.
 """
 
-__version__ = "0.10.0-rc1"
+__version__ = "0.10.0-rc2"