Bump underscore from 1.9.2 to 1.12.1 (#164)

Bumps [underscore](https://github.com/jashkenas/underscore) from 1.9.2 to 1.12.1.
- [Release notes](https://github.com/jashkenas/underscore/releases)
- [Commits](jashkenas/underscore@1.9.2...1.12.1)

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package-lock.json

@@ -38,7 +38,7 @@
     "showdown": "^1.9.1",
     "supertest": "^4.0.2",
     "tape": "^4.13.0",
-    "underscore": "~1.9.2"
+    "underscore": "~1.12.1"
   },
   "engines": {
     "node": "14.x"