Apply suggestions from code review

upstream: Merge suggested changes

http-api/src/main/java/net/runelite/http/api/ws/messages/party/PartyChatMessage.java

@@ -25,9 +25,9 @@
 package net.runelite.http.api.ws.messages.party;
 
 import lombok.Value;
-
+import net.runelite.api.events.Event;
 @Value
-public class PartyChatMessage extends PartyMemberMessage
+public class PartyChatMessage extends PartyMemberMessage implements Event
 {
 	private final String value;
-}
+}