Method call on `0.` float literals formats to incorrect code

```rust
pub fn main() {
    0. .to_string();
}
```
formats currently to:

```rust
pub fn main() {
    0..to_string();
}
```

Ideally this should be reformatted to be:

```rust
pub fn main() {
    (0.).to_string();
}
```

so as to avoid confusion.