systemd README: set mode of caddy.service to 644 instead of 744
systemd README: set mode of caddy.service to 644 instead of 744

yukimochi/caddy,dusty/caddy,dusty/caddy,devangels/caddy,elcore/caddy,captncraig/caddy,tobya/caddy,captncraig/caddy,captncraig/caddy,tobya/caddy,joshix/caddy,devangels/caddy,dusty/caddy,tobya/caddy,tobya/caddy,yukimochi/caddy,cez81/caddy,elcore/caddy,cez81/caddy,elcore/caddy,devangels/caddy,joshix/caddy,yukimochi/caddy,joshix/caddy,cez81/caddy,dusty/caddy