[README] Add "filter" to Requirements (#1827)

This extension is required by filter_var()
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ymeister 2020-11-08 07:25:06 +00:00 committed by GitHub
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@ -65,6 +65,7 @@ RSS-Bridge requires PHP 5.6 or higher with following extensions enabled:
- [`simplexml`](https://secure.php.net/manual/en/book.simplexml.php)
- [`curl`](https://secure.php.net/manual/en/book.curl.php)
- [`json`](https://secure.php.net/manual/en/book.json.php)
- [`filter`](https://secure.php.net/manual/en/book.filter.php)
- [`sqlite3`](http://php.net/manual/en/book.sqlite3.php) (only when using SQLiteCache)
Find more information on our [Wiki](https://github.com/rss-bridge/rss-bridge/wiki)