Merge pull request #27 from yasudatoshiyuki/patch-1

Fix incorrect mutation names in examples.

Author: jaydenseric

readme.md

@@ -34,7 +34,7 @@ So operations can be resolved while the files are still uploading, the fields ar
 {
   query: `
     mutation($file: Upload!) {
-      uploadFile(file: $file) {
+      singleUpload(file: $file) {
         id
       }
     }
@@ -141,7 +141,7 @@ Charlie file content.
   {
     query: `
       mutation($file: Upload!) {
-        uploadFile(file: $file) {
+        singleUpload(file: $file) {
           id
         }
       }