Log Message:
p5-PPIx-Regexp: update to 0.052.

0.052		2017-09-07	T. R. Wyant
    RT 122715: Clarify Node->find_parents() documentation. Thanks to
    Salvatore Bonaccorso for letting me know about this problem..

    Further deprecate tokenizer method prior() in favor of
    prior_significant_token().

    Add requirements_for_perl(). This is analogous to the
    CPAN::Meta::Requirements method requirements_for_module(), though
    the output is formatted differently. Also put in the actual
    requirements for an un-escaped literal left curly after a constant,
    which was removed in 5.25.1 and reinstated in 5.27.1.

    Add accepts_perl(). This is analogous to
    CPAN::Meta::Requirements->accepts_module(). I decided that
    CPAN::Meta;:Requirements was overkill, but this may turn out to be
    the wrong decision, so I will be careful what I expose.

    Document behavior of perl_version_introduced() and
    perl_version_removed() when a feature is re-introduced after
    removal, or re-removed after re-introduction.

    \N{} (empty curlys) removed in 5.27.1.