Log Message:
Update to 1.34

Upstream changes:
1.34 Oct 26 2020

- #50 Stop depending on constants dropped from Perl 5.28

1.33 Oct 26 2020

- #52 Fix memory corruption.
- #53 Fix for handling circular aliases.
- #56 syck.h: unconditionally include stdlib.h
- Switch changelog to a more parsible format.
- Update github CI to use a cpanfile.
- Update Devel::PPPort to 3.62