sudo and typo

README.md

 ```
 git clone https://git.home.spale.com/dhcp_protect.git
 cd dhcp_protect
-apt-get install build-essential uthash-dev libnetfilter-queue-dev
+sudo apt-get install build-essential uthash-dev libnetfilter-queue-dev
 make all
-make install
+sudo make install
 ```
 Note: the `make install` will automatically create, enable and start the systemd service and the `make uninstall` will stop and remove the systemd service.
 
 `iptables -A INPUT -p udp -m udp --dport 67 -j NFQUEUE --queue-num 67 --queue-bypass`
 
 ## Example IPv6
-`iptables -A INPUT -p udp -m udp --dport 547 -j NFQUEUE --queue-num 67 --queue-bypass`
+`ip6tables -A INPUT -p udp -m udp --dport 547 -j NFQUEUE --queue-num 67 --queue-bypass`
 
 # Configuration
 The configuration file may be tuned, but the defaults should be fine.