Support `L` notation in `Day-of-week`

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#10 创建于 2022年2月11日 5 条评论 0 个 reaction 已指派 0 人在 GitHub 查看

good first issue help wanted

描述

Now we can use L at `Day-of-month` like the following example;

```
cron_parser = CronParser.new('0 9 L * *')

time = Time.local(2022, 1, 16, 12, 0)
cron_parser.next(time)
# => 2022-01-31 09:00
```

I'd like to support L notation at `Day-of-week` in order to specify the last day of the week.

```
cron_parser = CronParser.new('0 9 * * 4L')

time = Time.local(2022, 1, 16, 12, 0)
cron_parser.next(time)
# => 2022-01-27 09:00

# Last Friday in this month!
```

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