Checking in changes prior to tagging of version 0.12.

Changelog diff is:

diff --git a/Changes b/Changes
index 64cc5ad..6e050b4 100644
--- a/Changes
+++ b/Changes
@@ -1,5 +1,8 @@
 Revision history for Perl extension Plack::Middleware::ServerStatus::Lite

+0.12   Thu Mar 7 9:24:24 2013
+       - requires JSON 2.xx
+
 0.11   Tue Feb 5 11:46:55 2013
        - uses 'ps -ax' instead of "-e" in *BSD os
        - supports IPv6