Log Message:
Update to 3.40

Upstream changes:
version 3.40: Thu Dec  6 01:44:16 UTC 2018
        - rt.cpan.org#122373 support IPv6 by using IO::Socket::IP over \ 
IO::Socket::INET
          [Gilles Lamiral and Mark Overmeer]
        - rt.cpan.org#127103 flags() undef value as an ARRAY reference on a \ 
bogus message
          [Gilles Lamiral]
        - rt.cpan.org#124523 update examples/populate_mailbox.pl timegm usage
          [Bernhard M. W.]
        - t/capability.t: added first set of tests
        - t/quota.t: minor fix when tests skipped