Update to 0.50

Upstream changes:
0.50    - 2020-12-21, H.Merijn Brand  <h.m.brand@xs4all.nl>
    * Update to Devel::PPPort-3.58
    * Prevent false negative CPANTESTERS fail reports
    * Prepare for perl7
    * Move to XSLoader
    * Update to Devel::PPPort-3.61
    * Update to Devel::PPPort-3.62
    * Fix META for bugtracker

(wen)