Update README.md

Author: PaulZC

README.md

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 SparkFun Artemis Firmware Uploader GUI
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-![Artemis Firmware Uploader GUI](https://cdn.sparkfun.com/assets/home_page_posts/3/2/4/5/Artemis_Firmware_Uploader_GUI.jpg)
+![Artemis Firmware Uploader GUI](https://cdn.sparkfun.com/assets/home_page_posts/3/1/2/3/Artemis-GUI-v2.jpg)
 
 The Artemis Firmware Uploader (AFU) is a simple to use GUI for updating firmware and the bootloader on Artemis based products.