always answer default "no" when updating redis

Author: Daniel Hansson

nextcloud_update.sh

@@ -38,7 +38,7 @@ if type pecl > /dev/null 2>&1
 then
     install_if_not php7.0-dev
     echo "Trying to upgrade the Redis Pecl extenstion..."
-    pecl upgrade redis
+    yes '' | pecl upgrade redis
     service redis-server restart
 fi