Fix issue with ArrayBuffer

lib/adapters/xhr.js

@@ -158,11 +158,6 @@ module.exports = function xhrAdapter(resolve, reject, config) {
     }
   }
 
-  // Format request data
-  if (utils.isArrayBuffer(requestData)) {
-    requestData = new DataView(requestData);
-  }
-
   if (requestData === undefined) {
     requestData = null;
   }