Improved document
Checking in changes prior to tagging of version 0.11.

Changelog diff is:

diff --git a/Changes b/Changes
index adcc99e..54b7734 100644
--- a/Changes
+++ b/Changes
@@ -1,7 +1,10 @@
 Revision history for Algorithm::HyperLogLog

+0.11    Web Apr 03 03:40:00 2013
+        - Inproved document
+
 0.10    Wed Apr 03 03:15:00 2013
-        - [improvement] register dump/restore feature
+        - [enhancement] register dump/restore feature
         - [bugfix] hash calculation error in big endian environment

 0.05    Wed Mar 27 23:30:00 2013
Optimize BYTESWAP()
Improved document
Add test for dump/restore feature