trivial: exclude markdown files from RAT
diff --git a/pom.xml b/pom.xml
index d8cd5e5..398e876 100644
--- a/pom.xml
+++ b/pom.xml
@@ -245,8 +245,8 @@
                         <exclude>velocity.log</exclude>
                         <!-- don't check anything in target -->
                         <exclude>target/*</exclude>
-                        <!-- README files in markdown format -->
-                        <exclude>README.md</exclude>
+                        <!-- files in markdown format -->
+                        <exclude>**/*.md</exclude>
                         <!-- Ignore files generated bei IDE plugins e.g. maven-eclipse-plugin -->
                         <exclude>maven-eclipse.xml</exclude>
                         <exclude>.*</exclude>