Update declarations to fix warnings in newer dokuwiki #4
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This plugin works on newer versions of Dokuwiki, (Release 2018-04-22a "Greebo") but generates warnings in the server log:
FastCGI sent in stderr: "PHP message: PHP Warning: Declaration of syntax_plugin_cli::handle($match, $state, $pos, &$handler) should be compatible wither $handler) in /var/lib/dokuwiki/lib/plugins/cli/syntax.php on line 0"