Use body instead of form for post request

lib/index.js

@@ -19,7 +19,7 @@ module.exports.create = function(config) {
 				'Content-Type': 'application/json'
 			},
 			json: true,
-			form: form
+			body: form
 		};
 		return request(req).then(function(resp) {
 			if (2 !== Math.floor(resp.statusCode / 100)) {