Update README.md

The command should be "sudo update-grub"

Author: RishiKakade

README.md

@@ -9,8 +9,8 @@ Credit to SHazardous for the Background image used. (https://www.nexusmods.com/f
 ### Installation
 
 Copy entire folder to your /boot/grub/themes directory.  
-Edit the /etc/default/grub file with Root permissions and change the #GRUB_THEME= line to #GRUB_THEME=/boot/grub/themes/crt-amber-theme/theme.txt  
-Run the command sudo update grub  
+Edit the /etc/default/grub file with Root permissions and change the #GRUB_THEME= line to #GRUB_THEME=/boot/grub/themes/CRT-Amber-GRUB-Theme/theme.txt  
+Run the command: sudo update-grub  
 Reboot
 
 If icons do not show beside their correct options, you need to edit your /etc/grub.d files to include the --class entry for each distro. It may be easier just to disable each one and create your own layout in the 40_custom file instead.