Bump js-yaml from 3.8.2 to 3.13.1 in /swagger-generator

Bumps [js-yaml](https://github.com/nodeca/js-yaml) from 3.8.2 to 3.13.1. - [Release notes](https://github.com/nodeca/js-yaml/releases) - [Changelog](https://github.com/nodeca/js-yaml/blob/master/CHANGELOG.md) - [Commits](nodeca/js-yaml@3.8.2...3.13.1) Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

swagger-generator/package-lock.json

@@ -23,7 +23,7 @@
  "dependencies": {
  "elasticsearch-client-specification": "file:../specification",
  "express": "^4.16.3",
- "js-yaml": "3.8.2",
+ "js-yaml": "3.13.1",
  "lodash": "^3.10.1",
  "swagger-editor-dist": "^3.6.3",
  "swagger-ui-dist": "^3.17.2"