Single dot import error

flint shows an error when using a single dot import line in a file:

```
internal/ast/nes.go => plugin 'imports' failed: invalid one liner import : import . "github.com/retroenv/nesgo/pkg/addressing"
```

the import is:

```
import . "github.com/retroenv/nesgo/pkg/addressing"
```

what works instead:

```
import (
	. "github.com/retroenv/nesgo/pkg/addressing"
)
```
