Fix JsonProperty on new objects

Author: TheoKanning

api/src/main/java/com/theokanning/openai/OpenAiResponse.java

@@ -35,6 +35,6 @@ public class OpenAiResponse<T> {
     /**
      * True if there are objects after lastId
      */
-    @JsonProperty("hasMore")
+    @JsonProperty("has_more")
     public boolean hasMore;
 }

api/src/main/java/com/theokanning/openai/threads/ThreadRequest.java

@@ -23,14 +23,12 @@ public class ThreadRequest {
     /**
      * A list of messages to start the thread with. Optional.
      */
-    @JsonProperty("messages")
     List<MessageRequest> messages;
 
     /**
      * Set of 16 key-value pairs that can be attached to an object.
      * This can be useful for storing additional information about the object in a structured format.
      * Keys can be a maximum of 64 characters long, and values can be a maximum of 512 characters long.
      */
-    @JsonProperty("metadata")
     Map<String, String> metadata;
 }