Log Message:
Update to 0.018

Upstream changes:
0.018           2021-10-22      T. R. Wyant
    Argument postderef is now fatal.

    Correct generation of 'provides' metadata.  Thanks to Favio Poletti
    for blogging
    https://github.polettix.it/ETOOBUSY/2021/06/15/the-real-pause-workaround/,
    and ultimately to Joel Berger for the pointer to
    https://metacpan.org/pod/CPAN::Meta::Spec#no_index