Checking in changes prior to tagging of version 0.02.

Changelog diff is:

diff --git a/Changes b/Changes
index c6c5c38..cae08ff 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,12 @@ Revision history for Perl extension Plack-Middleware-Session-Simple

 {{$NEXT}}

+0.02 2013-10-27T14:43:31Z
+
+    - [incompatible change] change default session id generator.
+      more compatibility with Plack-Middleware::Session
+    - add sid_generator and sid_validator options
+
 0.01 2013-10-25T05:17:21Z

     - original version