### What it does
Checks for the use of `.iter().count()`.

### Why is this bad?
`.len()` is more efficient and more
readable.

### Example
```
let some_vec = vec![0, 1, 2, 3];

some_vec.iter().count();
&some_vec[..].iter().count();
```

Use instead:
```
let some_vec = vec![0, 1, 2, 3];

some_vec.len();
&some_vec[..].len();
```