ddns-script: fix update_url incorrect for duckdns.org service
Maintainer: Christian Schoenebeck <christian.schoenebeck@gmail.com>
Compile tested: arch:arm, OpenWRT/LEDE version:for-15.05
Run tested: arch:arm, OpenWRT/LEDE version:for-15.05, tests done
Description:
<ddns-script>: fix update_url incorrect for duckdns.org service
Signed-off-by: Wendy Wu <wendy2001011@163.com>