downsize yt previews, maxresdefault does not work for all videos. close #761. (#777)
downsize yt previews, maxresdefault does not work for all videos. close #761. (#777)


TimCliff/steemit.com,steemit/steemit.com,GolosChain/tolstoy,GolosChain/tolstoy,TimCliff/steemit.com,TimCliff/steemit.com,steemit/steemit.com,GolosChain/tolstoy,steemit/steemit.com