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>

net/ddns-scripts/Makefile

@@ -12,7 +12,7 @@ PKG_NAME:=ddns-scripts
 PKG_VERSION:=2.7.6
 # Release == build
 # increase on changes of services files or tld_names.dat
-PKG_RELEASE:=19
+PKG_RELEASE:=20
 
 PKG_LICENSE:=GPL-2.0
 PKG_MAINTAINER:=Christian Schoenebeck <christian.schoenebeck@gmail.com>

net/ddns-scripts/files/services

@@ -84,7 +84,7 @@
 
 "dtdns.com"		"http://www.dtdns.com/api/autodns.cfm?id=[DOMAIN]&pw=[PASSWORD]&ip=[IP]"
 
-"duckdns.org"		"http://www.duckdns.org/update?domains=[USERNAME]&token=[PASSWORD]&ip=[IP]"	"OK"
+"duckdns.org"		"http://www.duckdns.org/update?domains=[DOMAIN]&token=[PASSWORD]&ip=[IP]"	"OK"
 
 "duiadns.net"		"http://ip.duiadns.net/dynamic.duia?host=[DOMAIN]&password=[PASSWORD]&ip4=[IP]"