Changed snowflake GetCreatedAt() -> CreatedAt

src/Discord.Net.WebSocket/Entities/Channels/SocketChannel.cs

@@ -10,6 +10,7 @@ namespace Discord.WebSocket
     [DebuggerDisplay(@"{DebuggerDisplay,nq}")]
     public abstract class SocketChannel : SocketEntity<ulong>, IChannel
     {
+        public DateTimeOffset CreatedAt => DateTimeUtils.FromSnowflake(Id);
         public IReadOnlyCollection<SocketUser> Users => GetUsersInternal();
 
         internal SocketChannel(DiscordSocketClient discord, ulong id)