xhrOptions options param to pass to bureaucracy

readme.markdown

@@ -212,9 +212,12 @@ If you wish to set up file uploads, _in addition to letting the user just paste
   // image field key, passed to bureaucracy, which defaults to 'uploads'
   fieldKey: 'uploads',
 
-  // optional additional form submission data, passed to bureaucracy
+  // optional additional form submission data, passed to `bureaucracy`
   formData: { description: 'A new image' },
 
+  // optional options for `xhr` upload request, passed to `bureaucracy`
+  xhrOptions: { headers: {} },
+
   // optional text describing the kind of files that can be uploaded
   restriction: 'GIF, JPG, and PNG images',
 

src/prompts/prompt.js

@@ -112,6 +112,7 @@ function prompt (options, done) {
       method: upload.method,
       formData: upload.formData,
       fieldKey: upload.fieldKey,
+      xhrOptions: upload.xhrOptions,
       endpoint: upload.url,
       validate: 'image'
     });