### What it does
Checks for collapsible `else { if ... }` expressions
that can be collapsed to `else if ...`.

### Why is this bad?
Each `if`-statement adds one level of nesting, which
makes code look more complex than it really is.

### Example
```

if x {
    …
} else {
    if y {
        …
    }
}
```

Should be written:

```
if x {
    …
} else if y {
    …
}
```