Changed snowflake GetCreatedAt() -> CreatedAt

src/Discord.Net.WebSocket/Entities/Roles/SocketRole.cs

@@ -20,6 +20,7 @@ namespace Discord.WebSocket
         public GuildPermissions Permissions { get; private set; }
         public int Position { get; private set; }
 
+        public DateTimeOffset CreatedAt => DateTimeUtils.FromSnowflake(Id);
         public bool IsEveryone => Id == Guild.Id;
         public string Mention => MentionUtils.MentionRole(Id);