chore(package): update @types/node to version 12.0.5

Closes #45

Author: greenkeeper[bot]

package.json

@@ -61,7 +61,7 @@
         "@types/lodash": "^4.14.108",
         "@types/mocha": "^5.2.0",
         "@types/morgan": "^1.7.32",
-        "@types/node": "^11.9.0",
+        "@types/node": "^12.0.5",
         "@types/rx": "^4.1.1",
         "@types/ua-parser-js": "^0.7.32",
         "chai": "^4.1.2",