Check for wget or curl

Fix #37

wireguard-install.sh

@@ -176,6 +176,13 @@ EOF
 }
 
 if [[ ! -e /etc/wireguard/wg0.conf ]]; then
+	# Detect some Debian minimal setups where neither wget nor curl are installed
+	if ! hash wget 2>/dev/null && ! hash curl 2>/dev/null; then
+		echo "Wget is required to use this installer."
+		read -n1 -r -p "Press any key to install Wget and continue..."
+		apt-get update
+		apt-get install -y wget
+	fi
 	clear
 	echo 'Welcome to this WireGuard road warrior installer!'
 	# If system has a single IPv4, it is selected automatically. Else, ask the user