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",