Bump @types/node from 6.14.6 to 12.12.31

Bumps [@types/node](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/node) from 6.14.6 to 12.12.31.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/node)

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

package.json

@@ -53,7 +53,7 @@
     "@types/marked": "0.0.27",
     "@types/mocha": "^2.2.32",
     "@types/mustache": "^0.8.28",
-    "@types/node": "^6.0.32",
+    "@types/node": "^12.12.31",
     "@types/request": "^2.47.0",
     "@types/striptags": "^3.1.1",
     "chai": "^3.5.0",