Relax HTTParty gem requirement

[wulffeld]

The gemspec currently requires v0.14 which is 5+ years old or so.

[bo-oz]

Happy to merge a pull request to do so.

[wulffeld]

Here you go :) #42

[jrochkind]

Would you consider accepting a PR to change HTTPParty to some other http gem? I HTTPParty is kind of an odd http client, which in most benchmarks has pretty poor performance.

Failing that, in merging the PR that @wulffeld helpfully submitted! :)

I am investigating doing some stuff with vimeo, and considering using your gem (I'm not sure if anything else exists that uses current vimeo APIs), but also considering forking it for my own use.