help 

		[PluginReference]
		private Plugin BetterChat;


		[HookMethod("OnBetterChat")]
		private object OnBetterChat(Dictionary<string, object> data)
		{
			var player = data["Player"] as IPlayer;
			//var Username = data["Username"] as IPlayer;
			var message = data["Text"] as string;

			data["Text"] = message;

			return data;
		}

I did not know the API was changed and only spent time.

:(