update headers list init

Author: tsolakoua

src/main/java/com/amadeus/Constants.java

@@ -1,6 +1,7 @@
 package com.amadeus;
 
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.List;
 
 /**
@@ -43,16 +44,14 @@ public final class Constants {
   public static final String EXPIRES_IN = "expires_in";
 
   // APIs which need an X-HTTP-Method-Override GET HEADER
-  public static final List<String> APIS_WITH_EXTRA_HEADER = new ArrayList<String>() {
-    {
-      add("/v2/shopping/flight-offers");
-      add("/v1/shopping/seatmaps");
-      add("/v1/shopping/availability/flight-availabilities");
-      add("/v2/shopping/flight-offers/prediction");
-      add("/v1/shopping/flight-offers/pricing");
-      add("/v1/shopping/flight-offers/upselling");
-    }
-  };
+  public static final List<String> APIS_WITH_EXTRA_HEADER = new ArrayList<String>(Arrays.asList(
+      "/v2/shopping/flight-offers",
+      "/v2/shopping/flight-offers",
+      "/v1/shopping/seatmaps",
+      "/v1/shopping/availability/flight-availabilities",
+      "/v2/shopping/flight-offers/prediction",
+      "/v1/shopping/flight-offers/pricing",
+      "/v1/shopping/flight-offers/upselling"));
 
   /**
    * The caller references the constants using <tt>Consts.EMPTY_STRING</tt>,