Exclude the CONTRIBUTING file from the rat check
diff --git a/project/pom.xml b/project/pom.xml
index 91e0830..fd81743 100644
--- a/project/pom.xml
+++ b/project/pom.xml
@@ -157,6 +157,7 @@
             <exclude>**/README.md</exclude>
             <exclude>**/README.txt</exclude>
             <exclude>**/DEPENDENCIES</exclude>
+            <exclude>**/CONTRIBUTING.md</exclude>
 
             <!-- one-line service registry files -->
             <exclude>**/*ProviderMetadata</exclude>