fix(package): update celebrate to version 9.1.0

Closes #108

Author: greenkeeper[bot]

package.json

@@ -34,7 +34,7 @@
     "@types/node": "^10.0.3",
     "@types/serve-favicon": "^2.2.30",
     "body-parser": "^1.18.2",
-    "celebrate": "^8.0.0",
+    "celebrate": "^9.1.0",
     "cookie-parser": "^1.4.3",
     "cors": "^2.8.4",
     "debug": "^3.1.0",