Upstream changes:
0.72 2018-04-02 19:34:27
[CHANGES]
* Expanded docs on Stream's on_read sub return values
* Overridable timeout for IO::Async::Test::wait_for
* Hide IO::Async::ChildManager as an internal implementation detail;
move the docs into main IO::Async::Loop
* Added $loop->open_process; suggest using that instead of
->open_child
* Begin implementation of $loop->is_running method (part of RT123780)
[BUGFIXES]
* Make IO::Async::Future->await wait until it's ready
* Fix calculation of periodic timer in 'skip' mode (RT124414)
* Perform synchronous getaddrinfo shortcut even for service-less
lookups
* Make sure that errors from underlying read/write functions are
debug-logged by IO::Async::Stream
094cc951f6