Bugfix for missed @expose annotation

Author: Brian Melton

graphsdk/src/main/java/com/microsoft/graph/http/ReferenceRequestBody.java

@@ -2,13 +2,15 @@
 
 
 import com.google.gson.JsonObject;
+import com.google.gson.annotations.Expose;
 import com.google.gson.annotations.SerializedName;
 import com.microsoft.graph.serializer.IJsonBackedObject;
 import com.microsoft.graph.serializer.ISerializer;
 
 public class ReferenceRequestBody implements IJsonBackedObject {
 
     @SerializedName("@odata.id")
+    @Expose
     public String odataId;
 
     /**