Re-running a Query missing dependency

Hi there,

I think there is missing dependency in a hook in Readme:

```javascript
// Listen for changes to `query` and re-run cypher if anything changes
useEffect(() => {
    run({ query })
}, [ query ])
```

Should be

```javascript
// Listen for changes to `query` and re-run cypher if anything changes
useEffect(() => {
    run({ query })
}, [ run, query ])
```