Update README.md

Author: gmazzo

README.md

@@ -56,14 +56,6 @@ internal object BuildConfig {
 }
 ```
 
-> [!IMPORTANT]
-> Avoid generating `File` entries with `Project.file` API, as they are created with absolute paths, and it will produce
-> cache misses.
-> ```kotlin
-> buildConfigField("FILE", file("aFile")) // will create a file targeting `/your/project/root/aFile` -> DON'T!
-> buildConfigField("FILE", file("aFile").relativeToOrSelf(projectDir)) // use this instead, for instance
-> ```
-
 ## Usage in Groovy
 
 On your `build.gradle` add: