Update pg-promise to the latest version 🚀 (#5413)

* fix(package): update pg-promise to version 8.6.2

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

Author: greenkeeper[bot]

package-lock.json

@@ -35,7 +35,7 @@
     "mime": "2.4.0",
     "mongodb": "3.1.13",
     "parse": "2.2.1",
-    "pg-promise": "8.6.1",
+    "pg-promise": "8.6.2",
     "redis": "2.8.0",
     "semver": "5.6.0",
     "tv4": "1.3.0",