Small change to the README credits.

README.md

@@ -78,7 +78,7 @@ Contact the project creator (ITzTravelInTime aka Pietro):
 - Changes to the provvided source code are documented using git, so for any info about any changes made please see the commit history here on the repo.
 
 # Credits:
-- Apple for macos and installer apps and scripts.
+- Apple for macOS, system icons and installer apps (and their createinstallmedia executable).
 - Special tahnks to:
 Francesco Perchiazzi, Nicola Tomarelli, Roberto Sciortino, Raffaele Sonnessa, Ermanno Nicoletti, Tommaso Dimatore, Michele Vitiello Bonaventura, Massimiliano Faralli, Davide Dessì, Giorgio Dall'Aglio, Peter Paul Chato, Antonio De Masi, the Facebook group ["Italian Hackintosh group!!"](https://www.facebook.com/groups/Italia.hackintosh/?fref=ts), the Telegram group ["Hackintosh Italia"](https://t.me/Hackintoshitalia).
 - Gianmarco Gargiulo for the New app icon and usb drive image.