Update README.md

Author: thomasvt

README.md

@@ -196,6 +196,10 @@ Build the now updated Box2dNet solution and use the dll in your game, or directl
 
 # History
 
+## 2025/11/02: v3.1.8.6 for Box2D v3.1.1
+
+* Regenerated for latest commits on Box2D
+
 ## 2025/08/03: v3.1.8.5 for Box2D v3.1.1
 
 * Regenerated for latest commits on Box2D