Update README

Why am I so lame that I can’t get the formatting right?

README.md

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 ## Changes ##
 v1.0 - 6/24/2013 - Initial release of PHP/MySQL based (non-Django) version of the spidergraph.
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 v1.01 - 1/7/2014 - Added SESSION var to update and delete lines so you can only update/delete items from your own institution.
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 v1.02 - 1/8/2014 - Added a line to delete install.php after it runs so you can't overwrite the database on accident later.