remove pg-native from dependencies

`npm run test` seems to be adding this

Author: Josh

package.json

@@ -22,7 +22,6 @@
     "js-string-escape": "1.0.1",
     "packet-reader": "0.3.1",
     "pg-connection-string": "0.1.3",
-    "pg-native": "^2.2.0",
     "pg-pool": "~2.0.3",
     "pg-types": "~1.12.1",
     "pgpass": "1.x",