Bring aboard ChangeLog file.

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+v1.1 - 2011-08-26 - TCP ping
+---------------------------------
+ - TCP ping throught ACK/RST segments at configurable transport layer port;
+ - Improvement of MessagePayload class with append(), also a 32 bits versions of
+   encode() and decode() methods;
+
+
+v1.0 - 2011-07-30 - ICMP ping
+---------------------------------
+ - Released the first version of pingcheck with support to a basic ICMP ping
+   through Echo Request, Echo Reply and Destination Unreachable packets;
+ - DNS resolver for IPv4 addresses through Andreas Haberstroh's Boost DNS
+   library;
+ - Caching of DNS resolved addresses until its time-to-live expires, which will
+   cause another query;
+ - The list of host to ping can be provided by a configuration file or by
+   command line;
+ - Using libi2ncommon for logging services;