Merge pull request #66 from mseemann/greenkeeper/@types/winston-2.3.4

Update @types/winston to the latest version 🚀

Author: mseemann

package.json

@@ -48,7 +48,7 @@
     "@types/serve-static": "^1.7.31",
     "@types/superagent": "^2.0.34",
     "@types/supertest": "^2.0.0",
-    "@types/winston": "2.2.0",
+    "@types/winston": "2.3.4",
     "chai": "^3.5.0",
     "codeclimate-test-reporter": "^0.4.0",
     "core-js": "^2.4.1",