Broken link to docs in README

[martimpassos]

Should point to https://smarnach.github.io/pyexiftool/

[sylikc]

Duplicate of #36 . smarnach no longer maintains this project. I'm on the most active fork at the moment

[sylikc]

@martimpassos I've updated my latest version to the refactored Python3 version v0.5.0. Should be easier to use, especially in your use case #38 ... you don't have to worry about using bytes and encoding params yourself! Some features have been jumbled around a bit. Can you review the newly updated documentation and see if it is coherent?

https://sylikc.github.io/pyexiftool/

(Please review and discuss on that issue thread if you can sylikc#28)