message: docs: Fix an image URL in README
diff: @@ -105,7 +105,7 @@ Setting has been deployed!
  ```
  In this exapmle, JavaScript and CSS Customization is set as below.
  -![Example screenshot of JavaScript and CSS Customization](https://raw.githubusercontent.com/msttttk/customize-uploader/master/pics/example_setting.PNG)
  +![Example screenshot of JavaScript and CSS Customization](https://raw.githubusercontent.com/kintone/customize-uploader/master/docs/example_setting.PNG)
  ## LICENSE
  MIT License
  