### What it does
Checks for `.checked_add/sub(x).unwrap_or(MAX/MIN)`.

### Why is this bad?
These can be written simply with `saturating_add/sub` methods.

### Example
```
let add = x.checked_add(y).unwrap_or(u32::MAX);
let sub = x.checked_sub(y).unwrap_or(u32::MIN);
```

can be written using dedicated methods for saturating addition/subtraction as:

```
let add = x.saturating_add(y);
let sub = x.saturating_sub(y);
```