updated version of SnakeYAML to 1.13
[#2141] Test emails with apostrophes
Merge pull request #2144 from baloo/improvements/2141-email-apostrophes

[#2141] Test emails with apostrophes
Merge pull request #2139 from codingricky/upgrade-snakeyaml

updated version of SnakeYAML to 1.13
Merge remote-tracking branch: upstream/master