Add attachment support about connector-slack

[jacobtomlinson]

@williln and @NMC-DAVE I am looking to merge this ocnnector and a few others into the core of opsdroid in opsdroid/opsdroid#530. I will explore adding this functionality once I've done that.

[NMC-DAVE]

So williln,
Do you successed to send attachments? I want to send images to slack.
Is there any clues? Very thanks!
Dave

[williln]

@NMC-DAVE I did not. As far as I can tell, Opsdroid isn't yet configured to allow for sending the arguments that the Slack API needs to do special formatting or to pass files/images. Sorry!

[kim0]

@jacobtomlinson Seems like slack connector was merged in Apr (Thank!) .. Any status update please for adding attachment support. I'm contemplating to use opsdroid, and that's one piece of functionality I would love to have! Thanks for good job on opsdroid!

[jacobtomlinson]

@kim0 Slack has always been supported. In April it got merged into opsdroid as a core connector instead of a plugin. There still isn't support for other message types, but it's high on my priority list.