Update README.md

README.md

@@ -191,7 +191,7 @@ These are the available config options for making requests. Only the `url` is re
 
   // `transformRequest` allows changes to the request data before it is sent to the server
   // This is only applicable for request methods 'PUT', 'POST', and 'PATCH'
-  // The last function in the array must return a string or an ArrayBuffer
+  // The last function in the array must return a string, an ArrayBuffer, or a Stream
   transformRequest: [function (data) {
     // Do whatever you want to transform the data
 
@@ -222,7 +222,7 @@ These are the available config options for making requests. Only the `url` is re
 
   // `data` is the data to be sent as the request body
   // Only applicable for request methods 'PUT', 'POST', and 'PATCH'
-  // When no `transformRequest` is set, must be a string, an ArrayBuffer or a hash
+  // When no `transformRequest` is set, must be a string, an ArrayBuffer, a hash, or a Stream
   data: {
     firstName: 'Fred'
   },
@@ -250,7 +250,7 @@ These are the available config options for making requests. Only the `url` is re
   }
 
   // `responseType` indicates the type of data that the server will respond with
-  // options are 'arraybuffer', 'blob', 'document', 'json', 'text'
+  // options are 'arraybuffer', 'blob', 'document', 'json', 'text', 'stream'
   responseType: 'json', // default
 
   // `xsrfCookieName` is the name of the cookie to use as a value for xsrf token