Checking in changes prior to tagging of version 0.20.

Changelog diff is:

diff --git Changes Changes
index 59db4e9..a206a60 100644
--- Changes
+++ Changes
@@ -2,6 +2,11 @@ Revision history for Perl extension Caroline

 {{$NEXT}}

+0.20 2014-04-11T05:18:39Z
+
+    - C-z -> sigtstp
+      (yoshidaster)
+
 0.19 2014-02-19T07:32:35Z

     commit 7564b30e50a30b233bac6614e97b7fbcf6ac4e0b