Lint on version requirements without a fully specified minimum bound

### What it does

Warns if a version req is `1.3` or `1` rather than `1.3.5`

### Advantage

This can help with more correct minimum bounds because patch packages can depend on changes in patch releases.

### Drawbacks

A false sense of confidence that a minimum bound is correct

### Example

```toml
serde = "1"
```

Could be written as:

```toml
serde = "1.0.219"
```
