Log Message:
p5-IO-Async: update to 0.77.

0.77    2020-05-13
        [CHANGES]
         * Updated for Metrics::Any 0.05
         * Report an info-type gauge metric to track loop types
         * Loop processing time should be a timer metric, not a distribution
         * Don't bother reporting zero-byte stream read/write metrics

        [BUGFIXES]
         * Skip metrics-related unit tests if metrics aren't active, even
           though we depend on Test::Metrics::Any
         * Account for MSWin32's EWOULDBLOCK in t/70future-io.t

0.76    2020-05-05
        [CHANGES]
         * Initial attempt at providing metrics via Metrics::Any
         * Renamed ->(un)watch_child API to ->(un)watch_process
         * Renamed 'child' LoopTests suite to 'process'