remove trailing spaces

lib/adapters/xhr.js

@@ -127,9 +127,9 @@ module.exports = function xhrAdapter(resolve, reject, config) {
 
   // Clean up request
   requestData = (requestData === undefined)
-                ? null 
+                ? null
                 : requestData;
-  
+
   // Send the request
   request.send(requestData);
 };