Update db schema for rails 5 changes
Update db schema for rails 5 changes

`id: :serial` is added because `id: :uuid` support was introduced.
https://github.com/rails/rails/pull/21762
`using: :btree` was redundant https://github.com/rails/rails/pull/27981
Standardaized column spacing was removed to avoid diffs about
aligining columns.
https://github.com/rails/rails/commit/df84e9867219e9311aef6f4efd5dd9ec675bee5c#r22545295

```diff
-   t.string "zipcode", limit: 5
+   t.string "zipcode",           limit: 5
+   t.string "extra_information", limit: 255
```

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