chore(deps): 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](https://github.com/nodeca/js-yaml/blob/master/CHANGELOG.md).* > 3.13.1 / 2019-04-05 > ------------------- > > - Fix possible code execution in (already unsafe) `.load()`, [#480](https://github-redirect.dependabot.com/nodeca/js-yaml/issues/480). > > > 3.13.0 / 2019-03-20 > ------------------- > > - Security fix: `safeLoad()` can hang when arrays with nested refs > used as key. Now throws exception for nested arrays. [#475](https://github-redirect.dependabot.com/nodeca/js-yaml/issues/475).

Commits

- [`665aadd`](https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da) 3.13.1 released - [`da8ecf2`](https://github.com/nodeca/js-yaml/commit/da8ecf24b63d2307015e75ee8bd1da1977071e35) Browser files rebuild - [`b2f9e88`](https://github.com/nodeca/js-yaml/commit/b2f9e882397660da37c5c5bb92e8ccc7bb9eb668) Merge pull request [#480](https://github-redirect.dependabot.com/nodeca/js-yaml/issues/480) from nodeca/toString - [`e18afbf`](https://github.com/nodeca/js-yaml/commit/e18afbf1edcafb7add2c4c7b22abc8d6ebc2fa61) Fix possible code execution in (already unsafe) load() - [`9d4ce5e`](https://github.com/nodeca/js-yaml/commit/9d4ce5e2895365c943d2bdf7e7c8ac1be3ec51a3) 3.13.0 released - [`f64c673`](https://github.com/nodeca/js-yaml/commit/f64c6737dbe24d110f53152d142d01e64520a193) Browser files rebuild - [`a567ef3`](https://github.com/nodeca/js-yaml/commit/a567ef3c6e61eb319f0bfc2671d91061afb01235) Restrict data types for object keys - [`59b6e76`](https://github.com/nodeca/js-yaml/commit/59b6e76b712350e9e6aad7773e7375a1de009cf9) Fix test name - See full diff in [compare view](https://github.com/nodeca/js-yaml/compare/3.12.2...3.13.1)

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[codecov-io]

Codecov Report

Merging #157 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #157   +/-   ##
=======================================
  Coverage   97.72%   97.72%           
=======================================
  Files           4        4           
  Lines          44       44           
  Branches        3        3           
=======================================
  Hits           43       43           
  Misses          1        1

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[dependabot[bot]]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.