Update pg-promise to the latest version 🚀 (parse-community#5299)

* fix(package): update pg-promise to version 8.5.5

* chore(package): update lockfile package-lock.json

Author: greenkeeper[bot]

package-lock.json

@@ -35,7 +35,7 @@
     "mime": "2.4.0",
     "mongodb": "3.1.11",
     "parse": "2.1.0",
-    "pg-promise": "8.5.4",
+    "pg-promise": "8.5.5",
     "redis": "2.8.0",
     "semver": "5.6.0",
     "tv4": "1.3.0",