Send Message


Hello, can send message, don't using handle?
and i cant send a image, don't work this schema.

```
		attachments := []schema.Attachment{
			{
				
				ContentType: "image/png",
				Name: "architecture-resize.png",
				ContentURL: "data:image/png;base64,{" + imgBase64Str +"}",
			},
		}

```

p.s I'm sorry for my English, but I'm from Russia)
