chore(package): update @types/node to version 12.6.4

Closes #98

Author: greenkeeper[bot]

package.json

@@ -34,7 +34,7 @@
     "@types/mongodb": "^3.1.14",
     "@types/mongoose": "5.5.7",
     "@types/morgan": "^1.7.32",
-    "@types/node": "12.0.5",
+    "@types/node": "12.6.4",
     "@types/passport": "1.0.0",
     "@types/passport-jwt": "^3.0.1",
     "@types/supertest": "^2.0.6",