Do not create history file if maximum history length was limited to 0.
Checking in changes prior to tagging of version 0.06.

Changelog diff is:

diff --git a/Changes b/Changes
index b913a5d..f5d33ed 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,11 @@ Revision history for Perl extension Caroline

 {{$NEXT}}

+0.06 2013-08-10T04:05:43Z
+
+    - Do not create history file if maximum history length was limited to 0.
+      (tokuhirom)
+
 0.05 2013-08-10T02:36:23Z

     - write_history_file, read_history_file.