use correct update url for feed and folder api, fix #529
use correct update url for feed and folder api, fix #529

IBBoard/news,IBBoard/news,IBBoard/news,Xefir/news,owncloud/news,itstar4tech/news,Xefir/news,owncloud/news,David-Development/news,Xefir/news,David-Development/news,itstar4tech/news,Xefir/news,itstar4tech/news,owncloud/news,David-Development/news,itstar4tech/news,David-Development/news,IBBoard/news