incremented version to CNPLv4

NPL.txt

@@ -1,7 +1,7 @@
 [Work Title]
 Copyright [Author] [Year]
 
-NON-VIOLENT PUBLIC LICENSE v3
+NON-VIOLENT PUBLIC LICENSE v4
 
 Preamble
 
@@ -18,7 +18,7 @@ Official Webpage: https://thufie.lain.haus/NPL.html
 Terms and Conditions
 
 THE WORK (AS DEFINED BELOW) IS PROVIDED UNDER THE TERMS OF THIS
-NON-VIOLENT PUBLIC LICENSE v3 ("LICENSE"). THE WORK IS PROTECTED BY
+NON-VIOLENT PUBLIC LICENSE v4 ("LICENSE"). THE WORK IS PROTECTED BY
 COPYRIGHT AND ALL OTHER APPLICABLE LAWS. ANY USE OF THE WORK OTHER THAN
 AS AUTHORIZED UNDER THIS LICENSE OR COPYRIGHT LAW IS PROHIBITED. BY
 EXERCISING ANY RIGHTS TO THE WORK PROVIDED IN THIS LICENSE, YOU AGREE

README.md

@@ -1,13 +1,13 @@
 # NPL
 
-The Non-Violent Public License v3 (NPLv3)
+The Non-Violent Public License v4 (NPLv4)
 
 License information and summary of purpose here:
 https://thufie.lain.haus/NPL.html
 
 This license is itself licensed under a custom license encouraging derivatives with different names
 and allowing free use otherwise for the sake of allowing creative adjustments while avoiding
-confusion.
+confusion. Please use the "+" at the end (like: NPLv4+) to allow future license revisions to apply.
 
 ## Notes:
-- Highly recommended to upgrade to version 3. A critical typo in section 1a was fixed.
+- Highly recommended to upgrade to at least version 3. A critical typo in section 1a was fixed.