Bump jsonschema from 1.2.6 to 1.4.0

Bumps [jsonschema](https://github.com/tdegrunt/jsonschema) from 1.2.6 to 1.4.0.
- [Release notes](https://github.com/tdegrunt/jsonschema/releases)
- [Commits](https://github.com/tdegrunt/jsonschema/compare/v1.2.6...v1.4.0)

---
updated-dependencies:
- dependency-name: jsonschema
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -39,7 +39,7 @@
     "github-linguist": "^2.4.3",
     "glob": "^7.1.7",
     "js-yaml": "^4.1.0",
-    "jsonschema": "1.2.6",
+    "jsonschema": "1.4.0",
     "long": "^4.0.0",
     "md5": "^2.2.1",
     "path": "^0.12.7",