fix(package): update pg to version 8.0.1

Closes #95

Author: greenkeeper[bot]

package.json

@@ -44,7 +44,7 @@
     "lodash": "^4.17.5",
     "mime-types": "^2.1.18",
     "mz": "^2.7.0",
-    "pg": "^7.4.1",
+    "pg": "^8.0.1",
     "pug": "^2.0.3",
     "rollbar": "^2.3.9",
     "sharp": "^0.20.1",