fix(package): update pg-promise to version 6.9.0 (#4205)

* fix(package): update pg-promise to version 6.9.0

Closes #4160

* Update .travis.yml

.travis.yml

@@ -30,7 +30,7 @@ env:
   - MONGODB_VERSION=3.4.4
   - PARSE_SERVER_TEST_DB=postgres
   - PARSE_SERVER_TEST_CACHE=redis
-  - NODE_VERSION=8.1.3
+  - NODE_VERSION=8.5
 before_install:
 - nvm install $NODE_VERSION
 - nvm use $NODE_VERSION

package.json

@@ -34,7 +34,7 @@
     "parse-server-push-adapter": "2.0.0",
     "parse-server-s3-adapter": "1.2.0",
     "parse-server-simple-mailgun-adapter": "1.0.0",
-    "pg-promise": "6.5.3",
+    "pg-promise": "6.9.0",
     "redis": "2.8.0",
     "request": "2.82.0",
     "semver": "5.4.0",