feature request - support clickable links

[dcsan]

with sketch's prototype feature you can add navigation links but the default PDF export doesn't seem to support these, even though PDF itself will, unless I'm missing something

(and it's odd because I'm sure i've used that feature with sketch once before)

I wonder if that's something you'd consider adding? It would allow to make simple transportable demo mockups

although perhaps a bit dependent on the PDF viewer, eg I dont think the mac default preview supports the hotspots