Fix rss feed error "Error on line 2: The processing instruction target matching "[xX][mM][lL]" is not allowed." while burn feed fr
2008-12-30 release v1.0
2009-02-04 release v1.01, fixed some errors, add create backup files before change php files, thanks for Willem Kossen's advice.
2009-02-16 release v1.02, fixed some errors
2009-05-24 release v1.03, add "check wordpress rss feed error" button, thanks for Wanda's advice.
2010-02-12 release v2.0, add backup and restore function.
2010-09-19 release v3.0, need not to modify error in php files directly, it will use a good and simple way, it just modify wp-blog-header.php in blog directory.
2011-08-10 release v3.1, only open Donate url in first usage time, thanks for Colin Reynolds's advice.