Bump @types/node from 11.13.8 to 12.0.0 (#1952)

Bumps [@types/node](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/node) from 11.13.8 to 12.0.0.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/node)

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

Author: dependabot[bot]

package-lock.json

@@ -45,7 +45,7 @@
   },
   "devDependencies": {
     "@types/mocha": "~5.2.6",
-    "@types/node": "~11.13.8",
+    "@types/node": "~12.0.0",
     "@types/rewire": "^2.5.28",
     "mocha": "~5.2.0",
     "mocha-junit-reporter": "~1.22.0",