Bump js-yaml from 3.12.2 to 3.13.1

[dependabot[bot]]

Bumps js-yaml from 3.12.2 to 3.13.1.

Changelog

Sourced from js-yaml's changelog.

[3.13.1] - 2019-04-05

Security

• Fix possible code execution in (already unsafe) .load(), #480.

[3.13.0] - 2019-03-20

Security

• Security fix: safeLoad() can hang when arrays with nested refs used as key. Now throws exception for nested arrays. #475.

Commits

• 665aadd 3.13.1 released
• da8ecf2 Browser files rebuild
• b2f9e88 Merge pull request #480 from nodeca/toString
• e18afbf Fix possible code execution in (already unsafe) load()
• 9d4ce5e 3.13.0 released
• f64c673 Browser files rebuild
• a567ef3 Restrict data types for object keys
• 59b6e76 Fix test name
• See full diff in compare view

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[coveralls]

Coverage remained the same at 95.402% when pulling 024b5a343bb639d6834f0e7439cba149de715bee on dependabot/npm_and_yarn/js-yaml-3.13.1 into f602dd1c7cae36a921b60bf8a19edcf04cd926a7 on master.