Initialize the limit

[liuuujr]

There are three ways to initialize a "Limit", which are "PerSecond(rate int)", "PerMinute(rate int)", "PerHour(rate int)". But the Limit generated by these three functions,the values of its "Rate" and "Burst" fields are equal。So I'd like to create a few more functions that initialize the LIMIT, which can specify the "rate" field and the "burst" field separately。

func PerHourWithCapacity(rate int, capacity int) Limit {
    return Limit{
        Rate:   rate,
        Period: time.Hour,
        Burst:  capacity,
    }
}

[tikhomirovv]

@liuuujr

The Limit is public, so you can configure it in your code to suit any needs. I don't think it's possible (or necessary) to cover every single case in a package.