Log Message:
p5-PPIx-Regexp: update to 0.055.

0.055		2018-02-08	T. R. Wyant
    Tokenizer method prior() is now fatal. This was documented as
    package-private, but as it WAS documented, I am putting it through a
    deprecation cycle anyway. Six months from now it will be removed.

    Add Script_Run classes as subclasses to their superclass docs. This
    was missed in the last update.