webhook deploy fix

bin/webhook.sh

@@ -56,7 +56,7 @@ if [ "$_domain" != "" ]; then
 fi
 done
 
-_id=echo "$_domain" | sed "s/./_/g"
+_id=$(echo "$_domain" | sed "s/./_/g")
 
 _remote=""
 while [ "$_remote" = "" ]