message: Use the `img` property. No `url` property
diff: @@ -79,7 +79,7 @@ Nifty!
  A bit of fun:
  -> `invoke-webrequest (Get-XkcdComicForToday).url -outfile image.png ; & ./image.png`
  +> `invoke-webrequest (Get-XkcdComicForToday).img -outfile image.png ; & ./image.png`
  ![Today's Comic](./pic.png)
  