Update README.md

Author: Matheus2212

README.md

@@ -11,4 +11,4 @@ It can also be omitted, but then the script will try to use $_SERVER values to b
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 ## Please Note
-This class NEEDS a .htaccess file that redirects the user to a specific page (usually the root/home page), otherwise the URL that it will work with may result in a 5XX error family (bad access). 
+This class NEEDS a .htaccess file that redirects the user to a specific page (usually the root/home page), otherwise the URL that it will work with may result in a 50X error family (bad access).