chore(package): update @types/node to version 14.0.6

Closes #45

Author: greenkeeper[bot]

package.json

@@ -29,7 +29,7 @@
   "devDependencies": {
     "@types/chai": "^4.1.6",
     "@types/mocha": "^5.2.5",
-    "@types/node": "^13.1.0",
+    "@types/node": "^14.0.6",
     "chai": "^4.2.0",
     "husky": "^4.0.2",
     "mocha": "^6.0.0",