Update version number to 5.3 in README.md

diff --git a/README.md b/README.md
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--- a/README.md
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@@ -6,7 +6,7 @@ _Formerly known as [WoltLab Community Framework](https://community.woltlab.com/t
 
 ## About Redactor II
 
-Redactor II is a WYSIWYG-editor created by Imperavi LLC., Copyright (c) 2009-2017. You can make use of Redactor II in any plugin or app for WSC 5.2 free of charge. You are not allowed to extract or re-use the editor (in entirety or in potions) for any other use unless you own a license for Redactor II.
+Redactor II is a WYSIWYG-editor created by Imperavi LLC., Copyright (c) 2009-2017. You can make use of Redactor II in any plugin or app for WSC 5.3 free of charge. You are not allowed to extract or re-use the editor (in entirety or in potions) for any other use unless you own a license for Redactor II.
 
 Please see http://imperavi.com/redactor/license/ for more information.