fix(package): update @types/node to version 14.0.4

Closes #59

Author: greenkeeper[bot]

package.json

@@ -66,7 +66,7 @@
     "typescript": "^2.4.1"
   },
   "dependencies": {
-    "@types/node": "^10.0.3",
+    "@types/node": "^14.0.4",
     "convert-source-map": "^1.5.0",
     "gulp-util": "^3.0.8",
     "paeckchen-core": "^0.4.2",