Fix item deserializing

common/src/main/java/us/myles/ViaVersion/api/minecraft/item/Item.java

@@ -1,6 +1,7 @@
 package us.myles.ViaVersion.api.minecraft.item;
 
 import com.github.steveice10.opennbt.tag.builtin.CompoundTag;
+import com.google.gson.annotations.SerializedName;
 import lombok.*;
 
 @Getter
@@ -10,6 +11,7 @@ import lombok.*;
 @ToString
 @EqualsAndHashCode
 public class Item {
+    @SerializedName(value = "identifier", alternate = "id")
     private int identifier;
     private byte amount;
     private short data;