Warning within React.StrictMode. Legacy API: String Refs

- react: 17.0.2
- react-dom: 17.0.2
- react-truncate-html: 0.1.7

Code:
```

...
here’s some HTML'
}}
/>
...

```

Console out:
```
Warning: A string ref, "paragraph", has been found within a strict mode tree. String refs are a source of potential bugs and should be avoided. We recommend using useRef() or createRef() instead. Learn more about using refs safely here: https://reactjs.org/link/strict-mode-string-ref
at Truncate
```

https://reactjs.org/link/strict-mode-string-ref

Start by inspecting the Truncate component implementation and locate the "paragraph" string ref reported in the StrictMode warning. Reproduce the example with React 17 StrictMode, then confirm the warning no longer appears while multiline HTML truncation still works.

Written by the indexing model from the issue text.