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kotlinlang

I'm a bit confused with this example from readme.md:
```
//if you have body to post it manually
<http://Fuel.post|Fuel.post>("<http://httpbin.org/post>").body("{ \"foo\" : \"bar\" }").response { request, response, result -&gt;
}
```
For such a body there should be a correct `Content-Type` specified. Something like `application/json`. But for the case like in the example I getting `Content-Type: application/x-www-form-urlencoded; charset=utf-8`