Update to 0.064
Upstream changes:
0.064 2019-04-01 T. R. Wyant
Empty \p{} should be an error.
\x{} and \x{ non-hex } should be errors under "use re 'strict'"
\o{} should be an error
\o{ non-octal } should be an error under "use re 'strict'"
Support wildcard Unicode property values. These were added in
5.29.9.
Add eg/find-variable-length-lookarounds
Add convenience method extract_regexps(). This is a static method
on PPIx::Regexp that takes as its argument a PPI::Document and
manufactures PPIx::Regexp objects out of anything that parses to a
regexp of some sort.
Don't run illegal character tests before Perl 5.18 unless we're
author testing, because they are noisy. I think the issue is not the
Perl version per se, but the version of Unicode; Perl5180delta says
it shipped with Unicode 6.2.
UnifiedSplitRaw
