Fix permission issue with wpa_supplicant country=FR append

README.md

@@ -381,7 +381,7 @@ sudo rfkill unblock wlan
 ```
 We add the country code in wpa_supplicant for Wireless LAN frequencies reglementations.
 ```sh
-sudo echo "country=FR" >> /etc/wpa_supplicant/wpa_supplicant.conf
+sudo sh -c 'echo "country=FR" >> /etc/wpa_supplicant/wpa_supplicant.conf'
 ```
 
 We create the access point configuration file for `network-manager`. Note that it will not be loaded if the permissions are not set to 0600 and file is not owned by `root`. You might also want to change the name, password, and WiFi band and channel.