Relicense to BSD-4

Mostly done because I don’t want anyone using my code without me knowing it. I have consent from all contributors.

LICENSE

@@ -1,4 +1,4 @@
-BSD 3-Clause License
+BSD 4-Clause License
 
 Copyright (c) 2022, Evelyn Belanger
 All rights reserved.
@@ -13,7 +13,10 @@ modification, are permitted provided that the following conditions are met:
    this list of conditions and the following disclaimer in the documentation
    and/or other materials provided with the distribution.
 
-3. Neither the name of the copyright holder nor the names of its
+3. All advertising materials mentioning features or use of this software must display the following acknowledgement: 
+   This product includes software developed by Evelyn Belanger.
+
+4. Neither the name of the copyright holder nor the names of its
    contributors may be used to endorse or promote products derived from
    this software without specific prior written permission.