Update README.md

[skip ci]

Signed-off-by: Ashley <73482956+ascopes@users.noreply.github.com>

Author: ascopes

README.md

@@ -229,8 +229,9 @@ support, running the Lombok annotation processor over the input. This assumes th
 JAR is already on the classpath for the JUnit test runner (e.g. is a test dependency in your
 project).
 
-You will want to make sure you do not attempt to target anything older than Java 9 in this case, since
-module support was only introduced in Java 9.
+> [!IMPORTANT]
+> You will want to make sure you do not attempt to target anything older than Java 9 in this case, since
+> module support was only introduced in Java 9.
 
 ```java