Add avatar decoration fields (#177)

src/main/java/discord4j/discordjson/json/AvatarDecorationData.java

@@ -0,0 +1,23 @@
+package discord4j.discordjson.json;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
+import com.fasterxml.jackson.databind.annotation.JsonSerialize;
+import discord4j.discordjson.Id;
+import org.immutables.value.Value;
+
+@Value.Immutable
+@JsonSerialize(as = ImmutableAvatarDecorationData.class)
+@JsonDeserialize(as = ImmutableAvatarDecorationData.class)
+public interface AvatarDecorationData {
+
+    static ImmutableAvatarDecorationData.Builder builder() {
+        return ImmutableAvatarDecorationData.builder();
+    }
+
+    String asset();
+
+    @JsonProperty("sku_id")
+    Id skuId();
+
+}

src/main/java/discord4j/discordjson/json/PartialMemberData.java

@@ -42,6 +42,9 @@ static ImmutablePartialMemberData.Builder builder() {
     @JsonProperty("communication_disabled_until")
     Possible<Optional<String>> communicationDisabledUntil();
 
+    @JsonProperty("avatar_decoration_data")
+    Possible<Optional<AvatarDecorationData>> avatarDecoration();
+
     default long flags() {
         return 0L;
     }

src/main/java/discord4j/discordjson/json/ResolvedMemberData.java

@@ -36,6 +36,9 @@ static ImmutableResolvedMemberData.Builder builder() {
     @JsonProperty("communication_disabled_until")
     Possible<Optional<String>> communicationDisabledUntil();
 
+    @JsonProperty("avatar_decoration_data")
+    Possible<Optional<AvatarDecorationData>> avatarDecoration();
+
     default long flags() {
         return 0L;
     }

src/main/java/discord4j/discordjson/json/UserData.java

@@ -59,4 +59,7 @@ static ImmutableUserData.Builder builder() {
 
     @JsonProperty("public_flags")
     Possible<Long> publicFlags();
+
+    @JsonProperty("avatar_decoration_data")
+    Possible<Optional<AvatarDecorationData>> avatarDecoration();
 }

src/main/java/discord4j/discordjson/json/gateway/GuildMemberUpdate.java

@@ -3,6 +3,7 @@
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import com.fasterxml.jackson.databind.annotation.JsonSerialize;
+import discord4j.discordjson.json.AvatarDecorationData;
 import discord4j.discordjson.json.UserData;
 import discord4j.discordjson.Id;
 import discord4j.discordjson.possible.Possible;
@@ -42,4 +43,7 @@ static ImmutableGuildMemberUpdate.Builder builder() {
     @JsonProperty("communication_disabled_until")
     Possible<Optional<String>> communicationDisabledUntil();
 
+    @JsonProperty("avatar_decoration_data")
+    Possible<Optional<AvatarDecorationData>> avatarDecoration();
+
 }