chore: Upgrade Prettier 1.8 -> 2.0 (#1436)

server/presenters/policy.js

@@ -6,7 +6,7 @@ type Policy = { id: string, abilities: { [key: string]: boolean } };
 export default function present(user: User, objects: Object[]): Policy[] {
   const { serialize } = require("../policies");
 
-  return objects.map(object => ({
+  return objects.map((object) => ({
     id: object.id,
     abilities: serialize(user, object),
   }));