Update grub after Manjaro

Because I dual boot Linux, after a new install, I always get around to changing 
grubs timeout to at least 20 seconds.

In Manjaro I use this command:
sudo nano /boot/grub/grub.cfg

export theme
if [ x$feature_timeout_style = xy ] ; then
set timeout_style=hidden
set timeout=20
# Fallback hidden-timeout code in case the timeout_style # feature is
# unavailable.
elif sleep --interruptible 5 ; then
set timeout=0
fi
# END /etc/grub.d/00_header