update manifest
Checking in changes prior to tagging of version 0.11.

Changelog diff is:

diff --git a/Changes b/Changes
index 426682e..5459067 100644
--- a/Changes
+++ b/Changes
@@ -1,5 +1,8 @@
 Revision history for Perl extension Plack::Middleware::Deflater

+0.11  Tue Aug 6 23:24:07 JST 2013
+        - fix bug around crc calculation and footer generation. Thanks syohex-san
+
 0.10  Fri Jul 19 10:42:33 JST 2013
         - replace IO::Compress with PM::Deflater::Encoder for performance improvement