Update README.md

added missing linux-headers to components install step

README.md

@@ -13,7 +13,7 @@ Flash the system onto the phone (either to an SD card or directly to the eMMC wi
 Open a terminal on the phone (either through SSH, the serial connection or directly on the screen) and run this:
 ```
 # components
-$ sudo apk add waybar bemenu swaylock swayidle networkmanager htop pavucontrol
+$ sudo apk add linux-headers waybar bemenu swaylock swayidle networkmanager htop pavucontrol
 
 # build tools
 $ sudo apk add git make meson ninja cargo