Array of nullable results array of non-nullable?

Input:
```yaml
Sample:
  type: object
  required: [metrics]
  properties:
    metrics:
      type: array
      items:
        nullable: true
        type: number
```

Output:
```go
// Sample defines model for Sample.
type Sample struct {
	Metrics []float32 `json:"metrics"`
}
```

Expected:
```go
// Sample defines model for Sample.
type Sample struct {
	Metrics []*float32 `json:"metrics"`
}
```