Fix typo in README

Author: map220v

README.md

@@ -3,5 +3,5 @@ This repo contians scripts for automatic building of ubuntu rootfs for Xiaomi Pa
 
 # Install info
 - rootfs.img must be flashed to partition named "linux"
-- Partition for efi boot must be named "efs"
+- Partition for efi boot must be named "esp"
 - Install grub using grub-install and grub-mkconfig -o /boot/grub/grub.cfg. If done from android make sure that efs partition mounted at /boot/efi, after generating grub.cfg change all of "/dev/block/" to "/dev/"