dice: clean up the code

sendable.go

@@ -353,15 +353,19 @@ func (p *Poll) Send(b *Bot, to Recipient, opt *SendOptions) (*Message, error) {
 
 	return extractMessage(data)
 }
+
+// Send delivers dice through bot b to recipient
 func (d *Dice) Send(b *Bot, to Recipient, opt *SendOptions) (*Message, error) {
 	params := map[string]string{
 		"chat_id": to.Recipient(),
 		"emoji":   string(d.Type),
 	}
 	embedSendOptions(params, opt)
+
 	data, err := b.Raw("sendDice", params)
 	if err != nil {
 		return nil, err
 	}
+
 	return extractMessage(data)
 }