fix(package): update winston to version 3.1.0

Closes #14

Author: greenkeeper[bot]

package.json

@@ -46,6 +46,6 @@
     "typedi": "^0.6.0",
     "typeorm": "0.1.8",
     "typeorm-typedi-extensions": "^0.1.1",
-    "winston": "^2.4.0"
+    "winston": "^3.1.0"
   }
 }