remember the URI might be a good idea

[jzhang533]

remember the URI of the url processing might be a good idea.

[mion]

Cool, thanks @jzhang533 ! But for some reason the test breaks* with:

TypeError: can't convert URI::Generic into String

No big deal though, I think it's just a matter of adding open-uri as a development dependency. Not that I think anyone is using the gem for anything serious after explicitly being told not to 😆, but maybe we could make it backward compatible with something like Harvestman.current_uri (and also leads to a nicer API)? Same thing for the other instace variables like @document. Ideas?
If not I'll just merge it anyway!

[*] Actually it was already 'broken' because it tests for a missing feature I wanted to add.