update support library

build.gradle

@@ -20,7 +20,7 @@ apply plugin: 'pmd'
 apply plugin: 'findbugs'
 
 ext {
-    supportLibraryVersion = '24.2.0'
+    supportLibraryVersion = '24.2.1'
 
     travisBuild = System.getenv("TRAVIS") == "true"