Upgrade to the latest version of SnakeYAML Engine (3.0.1)

[asomov]

Apply the latest version:
https://bitbucket.org/snakeyaml/snakeyaml-engine/wiki/Changes

[asomov]

Should be fixed in the PR

[cowtowncoder]

Will not backport in 3.0.x due to major version difference (and module reference change), will go in 3.1.0 via 3.x.