Fix #10

-N is an illegal option for read in sh.

wireguard-install.sh

@@ -5,15 +5,15 @@
 # Copyright (c) 2020 Nyr. Released under the MIT License.
 
 
-# Discard stdin. Needed when running from an one-liner which includes a newline
-read -N 999999 -t 0.001
-
 # Detect Debian users running the script with "sh" instead of bash
 if readlink /proc/$$/exe | grep -q "dash"; then
 	echo 'This installer needs to be run with "bash", not "sh".'
 	exit
 fi
 
+# Discard stdin. Needed when running from an one-liner which includes a newline
+read -N 999999 -t 0.001
+
 # Detect OpenVZ 6
 if [[ $(uname -r | cut -d "." -f 1) -eq 2 ]]; then
 	echo "The system is running an old kernel, which is incompatible with this installer."