Update screenshot

Author: metaspartan

README.md

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 `mactop` is a terminal-based monitoring tool "top" designed to display real-time metrics for Apple Silicon chips written by Carsen Klock. It provides a simple and efficient way to monitor CPU and GPU usage, E-Cores and P-Cores, power consumption, and other system metrics directly from your terminal!
 
-![mactop](screenshot2.png)
+![mactop](screenshotnew.jpg)
 
 ## Compatibility