Use new RAT v0.15
diff --git a/pom.xml b/pom.xml
index d2f56cd..8edc776 100644
--- a/pom.xml
+++ b/pom.xml
@@ -86,7 +86,7 @@
     <javaVersion>1.8</javaVersion>
     <httpClientVersion>4.5.13</httpClientVersion>
     <loggerVersion>2.18.0</loggerVersion>
-    <apacheRatVersion>0.14</apacheRatVersion>
+    <apacheRatVersion>0.15</apacheRatVersion>
     <project.build.outputTimestamp>1</project.build.outputTimestamp>
   </properties>
   <issueManagement>