update getUploadLink call with headers'

src/operations/video_upload.gql

@@ -31,6 +31,10 @@ mutation CreateUploadStream(
 mutation GetUploadLink($videoId: Int!, $segmentIndex: Int!) {
   getUploadLink(videoId: $videoId, segmentIndex: $segmentIndex) {
     uploadUrl
+    headers {
+      key
+      value
+    }
   }
 }