do not linkify exe and zip links (close #1087)
do not linkify exe and zip links (close #1087)

* do not linkify exe and zip links
GolosChain/tolstoy,steemit/steemit.com,GolosChain/tolstoy,GolosChain/tolstoy,TimCliff/steemit.com,steemit/steemit.com,TimCliff/steemit.com,steemit/steemit.com,TimCliff/steemit.com