Implement file upload functions?

[mywarr]

Do you have plan implementing file upload functions?
For now it only accept attachment from payload.
it would be great if botly can upload attachment from local files or streaming from other libs such as node-webshot.

curl  \
  -F recipient='{"id":"USER_ID"}' \
  -F message='{"attachment":{"type":"file", "payload":{}}}' \
  -F filedata=@/tmp/receipt.pdf \
  "https://graph.facebook.com/v2.6/me/messages?access_token=PAGE_ACCESS_TOKEN" 

[miki2826]

added in 730318e