Merge pull request #245 from jupyterhub/renovate/winston-3.x

Update dependency winston to ~3.3.0

Author: consideRatio

package-lock.json

@@ -13,7 +13,7 @@
     "http-proxy": "^1.18.1",
     "lynx": "^0.2.0",
     "strftime": "~0.10.0",
-    "winston": "~3.2.0"
+    "winston": "~3.3.0"
   },
   "devDependencies": {
     "jasmine": "^3.5.0",