Bump underscore from 1.9.1 to 1.9.2

Bumps [underscore](https://github.com/jashkenas/underscore) from 1.9.1 to 1.9.2.
- [Release notes](https://github.com/jashkenas/underscore/releases)
- [Commits](https://github.com/jashkenas/underscore/compare/1.9.1...1.9.2)

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

package.json

@@ -14,7 +14,7 @@
     "opensans-webkit": "^1.0.1",
     "popper.js": "^1.15.0",
     "snyk": "^1.274.0",
-    "underscore": "^1.9.1",
+    "underscore": "^1.9.2",
     "vis": "^4.21.0",
     "webpack-merge": "^4.1.4"
   },