how to customize the context

Hi,

I'm new to flogger. Thanks for this wonderful fluent logger.

Currently, I use `atMostEvery()` often by calling `logger.at(level).atMostEvery(time, TimeUnit.MILLISECONDS).log(message);`

Is there's a way to customize the following context statement that are being appended to every log statement ?

`[CONTEXT ratelimit_period="2000 MILLISECONDS [skipped: 2]" ]` is a bit too verbose to my taste.

I'd like to shrink it down to just `[2000,2]`.

I hope I'm making a very reasonable request here :D

Thanks for any help!