page params for pagination

[harisadam]

Hi @sborod

I think including page parameters to the get_tag_media_nodes method's response would be a great feature.

I've implemented this feature to my fork: https://github.com/harisadam/ruby-instagram-scraper/commit/acc6f1f97cff420aaf43a920c440fd3168fd45da

basically it returns a hash - instead of Array - with 2 keys: nodes and page

let me know what you think, hope it is not against you concept