Release 9.0 (2020-02-27)

    New:
     * email address of users are no longer stored in the database. Only a
       nickname and a password are required to create an account;
     * deployment is now done with poetry;
     * removed a lot bad JavaScript code.
    Improvements:
     * feeds are now retrieved with requests. feedparser is only used for the
       parsing;
     * improvements to the crawler.
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