Merge pull request #915 from johamb/patch-1

Update SubjectCode.java to add subject code 'PMT'

library/src/main/java/org/mustangproject/SubjectCode.java

@@ -40,5 +40,9 @@ public enum SubjectCode {
   /**
    * Vehicle licence number
    */
-  ABZ
+  ABZ,
+	/**
+	* Payment information
+	*/
+	PMT
 }