maintenance mode sed corrected

deploy.sh

@@ -47,9 +47,7 @@ scp -q -i $key_path $user@$server:$remote_dir/www/index.php temp/
 # set maintance mode if app is on remote
 if [ -f temp/index.php ] 
 then
-    sed -i "s/\/\/\s*require '.maintenance.php';/require '.maintenance.php';/" \
-        temp/index.php
-
+    sed -ri "/^(<\?php|<\?)/a require '.maintenance.php';" temp/index.php
 
     rsync -az \
     temp/index.php $user@$server:$remote_dir/www/