Log Message:
Update to 0.80

Upstream changes:
0.80 Thu 22 Aug 2019 01:17:13 PM CEST
 - Fix memory leak when loading invalid YAML (PR#93 tinita)

0.79 Tue 11 Jun 2019 09:35:22 PM CEST
 - Support aliasing scalars resolved as null or booleans (tinita)
 - Add YAML::XS::LibYAML::libyaml_version() (tinita)
 - Support standard !!int/!!float tags instead of dying (tinita)

0.78 Sat 18 May 2019 06:35:21 PM CEST
 - Fix double free/core dump when Dump()ing binary data, see issue#91
   (tinita)
 - Update config.h from libyaml (tinita)

0.77 Mon 15 Apr 2019 10:55:13 PM CEST
 - Update libyaml to version 0.2.2. Most important change for users is that
   plain urls in flow style can be parsed now. Example: `[ http://yaml.org
   ]`. (tinita)