Add another date format about feedkit HOT 2 CLOSED

I don't think this format is actually compliant with RFC2822 (well, RFC5322 now) since it doesn't include a time zone. Take a look at section 3.3 here and see what you think.

You can add this to the backupFormats list in RFC822DateFormatter.swift. That's the right place for formats that purport to be RFC822-class dates but aren't actually compliant (but that are nevertheless found in real-world feeds). It looks like the time zone will default to GMT, which seems reasonable. But it's probably worth verifying on some test feeds.

If you would, please add a version of the format that drops the day-of-week prefix (and comma) as well, since that seems to be a common mutation of RFC822 dates.

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Thank you for the issue @lironxyz and @GarthSnyder for helping out. If you feel you still need this, kindly open again.

Cheers

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