Checking in changes prior to tagging of version 0.20.

Changelog diff is:

diff --git a/Changes b/Changes
index 6184e52..de2df49 100644
--- a/Changes
+++ b/Changes
@@ -1,5 +1,10 @@
 Revision history for Perl extension AnyEvent::MPRPC

+0.20 2013-02-01T21:28:13
+
+    - Add 2 callbacks (before/after_connect) and 1 option (connect_timeout)
+      (hirose31)
+
 0.19

     - Split AnyEvent::MessagePack to it's own distribution.