variables must be a object

[yuu2lee4]

now it is a string which cant be analyze.

[cdaringe]

this happens when you don't set:

    headers: {
      'Accept': 'application/json',
      'Content-Type': 'application/json'
    },

in fetch.

[cdaringe]

otherwise, it's all zen.

[wilbooorn]

I'm actually running into this too... I have those headers set and variables is still coming through as a string.

[Soviut]

@fabiancook This PR should fix the issue #14