docs: update version compatibility

Author: timdeschryver

README.md

@@ -162,6 +162,7 @@ You may also be interested in installing `jest-dom` so you can use
 
 | Angular | Angular Testing Library |
 | ------- | ----------------------- |
+| 18.x | 16.x, 15.x, 14.x, 13.x |
 | 17.x | 16.x, 15.x, 14.x, 13.x |
 | 16.x | 14.x, 13.x |
 | >= 15.1 | 14.x, 13.x |