Lower-case readme file name and add changelog to it.

readme

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+This is a Nagios plugin to check the expiration date of a domain name.
+It uses the "whois" command, which usually comes as a "whois" package.
+Debian/Ubuntu: apt-get install whois
+
+Original version had this copyright notice in it:
+Copyright (c) 2005 Tomàs Núñez Lirola <tnunez@criptos.com>,
+     2009-2012 Elan Ruusamäe <glen@delfi.ee>, under GPL License
+
+Ryan found it hosted at:
+http://git.pld-linux.org/gitweb.cgi/?p=packages/nagios-plugin-check_domain.git
+
+This is a modified version, hosted at https://github.com/Elyrith/check_domain
+Currently supports .com, .ca, .tv, .ee, .ru
+Support for .ca and .se by Ryan Loudfoot (elyrith@gmail.com)
+Support for Performance Data by Ryan Loudfoot
+
+If you would like to add a TLD, send me the code or a pull request. If you want me to add one, let me know and I'll see what I can do.
+
+Change log:
+2013-09-06 - Version 0.92
+-Modified the .com result to work for more domains since not all registrars have everything the same way
+-Change readme to be lower-case for the file name
+-Created changelog