title prop

title prop which set's the SVG <title> https://developer.mozilla.org/en-US/docs/Web/SVG/Element/title#Example

```
<svg width="220" height="70" xmlns="http://www.w3.org/2000/svg">
  <title>SVG Title Demo example</title>
  <rect x="10" y="10" width="200" height="50"
    style="fill:wheat; stroke:blue; stroke-width:1px">
</svg>
```

Would you be okay with a PR for this?