RFR - Ma add reviews

Indentation on the validations should be like this:

```ruby
  validates :timeframe,
    presence: true,
    inclusion: { in: TIMEFRAMES }
  validates :direction,
    presence: true,
    inclusion: { in: DIRECTIONS }
  validates :day,
    presence: true,
    inclusion: { in: DAYS }
  validates :bus,
    presence: true,
    uniqueness: { scope: [:timeframe, :day, :direction] }
```
Similarly, indentation for the `TIMEFRAMES` constant should be like this:

```ruby
  TIMEFRAMES = [
    "6-9 AM",
    "9AM-12PM",
    "12-3PM",
    "3-6PM",
    "6-9PM",
    "9PM-12AM",
    "12-6AM"
  ]
```