Make TokenType final

Author: bleeding182

auth/src/main/java/com/davidmedenjak/auth/manager/TokenType.java

@@ -1,6 +1,6 @@
 package com.davidmedenjak.auth.manager;
 
-public class TokenType {
+public final class TokenType {
     private TokenType() {}
 
     public static String BEARER = "bearer";