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### What it does
Checks for iterating a map (`HashMap` or `BTreeMap`) and
ignoring either the keys or values.
### Why is this bad?
Readability. There are `keys` and `values` methods that
can be used to express that we only need the keys or the values.
### Example
```
let map: HashMap<u32, u32> = HashMap::new();
let values = map.iter().map(|(_, value)| value).collect::<Vec<_>>();
```
Use instead:
```
let map: HashMap<u32, u32> = HashMap::new();
let values = map.values().collect::<Vec<_>>();
```
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