reference the fact that you have to json.loads api calls

[elementc]

Another solution to #47, this time what @rawdigits said he was going to do- updating the docs to indicate that api_call returns the json text response as a string and not a dict.

I massively prefer #70 to this solution, but I've provided both options for your convenience.

[ghost]

Agreed, let's rev a major version on the client and switch to doing the JSON decode inside the client itself.