Log Message:
Update to 0.71

Upstream changes:
0.71    2016/12/22 15:05:50
        [CHANGES]
         * Added 'prefork' option to IO::Async::Channel (RT115920) - thanks
           GMARLER
         * Prefer Sereal Channel encoding if that module is available
         * Ensure that IaFunction still prints debug information on futures
         * Miscellaneous spelling fixes in docs - thanks genio

        [BUGFIXES]
         * 'use lib ".";' for perl 5.24
         * Make t/50resolver.t less sensitive to EAI_NONAME vs EAI_NODATA
           because some resolvers lie (RT113429)
         * Fix error message linefeed tests in t/50resolver.t (RT119369)
         * Ensure that SIGPIPE is ignored if it's still at its default value