Fix typo

Author: dondonz

README.md

@@ -24,7 +24,7 @@ This library provides extended validation of fields and field arguments for [gra
 ```
 
 ```groovy
-compile 'com.graphql-java:graphql-java-extended-validation:19.1'
+implementation 'com.graphql-java:graphql-java-extended-validation:19.1'
 ```
 
 > Note: