`binding.pry` left in the code

[vfonic]

I was browsing through the code and found the binding.pry in there. Not sure if it was left on purpose:
https://github.com/mikeyhew/shopify_api_mixins/blob/master/lib/shopify_api_mixins.rb#L11

[mikeyhew]

Definitely didn't leave that there on purpose. Thanks! I'll push an update soon