[ANN] clogger 2.3.0 - configurable request logging for Rack

Clogger is Rack middleware for logging HTTP requests. The log format
is customizable so you can specify exactly which fields to log.

Changes:

    clogger 2.3.0 - $request_time{POWER,PRECISION} support

    The $request_time can now be multiplied by a power-of-10,
    allowing up to nanosecond resolution without decimals.

    Thanks to Josh Natanson for contributing this feature:

    https://yhbt.net/clogger-public/CAPdx2swO4eaOWaqL4-rMLq1H7pH6w-i760vPJTb92tyKfcc01Q@mail.gmail.com/
    https://yhbt.net/clogger-public/CAPdx2szjqUuFjUtrgoeXXwmz0HzfdnWe+2h2Sp_ywDkTDVL0-g@mail.gmail.com/T/

    There's also some minor fixes and doc updates:

          clogger: fix _BSD_SOURCE and _SVID_SOURCE deprecation warnings
          doc: update with IMAPS, NNTPS, and .onion mail archive URLs
          doc: document Fiber.current

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