Log Message:
p5-autovivification: update to 0.18.

0.18    2017-11-04 15:30 UTC
        + Fix : [RT #123411] : Compatibility with CV-in-stash optimisation
                Thanks Father Chrysostomos for reporting and contributing a
                patch.
        + Fix : [RT #122956] : strict/warn flags seem to simply do nothing
                The documentation has been amended to clarify how these two
                options are supposed to be used.
                Thanks Christian Walde for reporting.