remove unwanted credit

README.md

@@ -24,5 +24,4 @@ Vous devriez avoir reçu une copie de la Licence Générale Publique GNU avec ce
 
 - [SPIP](https://github.com/spip/SPIP), Copyright © 2001-2018, Arnaud Martin, Antoine Pitrou, Philippe Rivière et Emmanuel Saint-James.
 - [AdminLTE](https://github.com/ColorlibHQ/AdminLTE), Copyright (c) 2014-2018 almasaeed2010
-- [jsTree Bootstrap Theme](https://github.com/orangehill/jstree-bootstrap-theme), Copyright (c) 2014 Orange Hill Development
-- [Bootstrap 4 Responsive Navbar with Multi level Dropdowns](https://github.com/bootstrapthemesco/bootstrap-4-multi-dropdown-navbar), Copyright (c) fontenele
+- [jsTree Bootstrap Theme](https://github.com/orangehill/jstree-bootstrap-theme), Copyright (c) 2014 Orange Hill Development