[Feature request] Upload to nextcloud / owncloud

[gabrielklein]

First thank you for your extension, it's just amazing :)

Currently we can upload image to imgur. What would be great is to support nextcloud (or owncloud) too as it starts to be quite popular as an alternative to dropbox.

Thank you very much :)

[gabrielklein]

Note: https://github.com/OttoAllmendinger/gnome-shell-screenshot/issues/58

[despens]

I have set it up for me, by saving screenshots to a Directory that is synced with my nextcloud via their desktop client. Works really well.