fix: TypeScript error in got package (#302)

got v11.5.0 introduced compilation error described in
sindresorhus/got#1350.
This issue suggests that upgrading @types/node to
v14.0.19+ solves the problem so let's just make this upgrade.

Author: alexander-fenster

package.json

@@ -44,6 +44,7 @@
   "devDependencies": {
     "@compodoc/compodoc": "^1.1.9",
     "@types/mocha": "^7.0.0",
+    "@types/node": "^14.0.20",
     "@types/proxyquire": "^1.3.28",
     "@types/sinon": "^9.0.0",
     "c8": "^7.0.0",