Fragment / jsxFragment support

Hi, this is a cool project, thanks so much.

I am using Typescript to compile the JSX, with this tsconfig.json:

```
"jsx": "react",
"jsxFactory": "h",
```

Most code is converted properly, except when using a fragment:

```
const foo = <>
row 1
row 2

```

this warning from Typescript is given:

> `The 'jsxFragmentFactory' compiler option must be provided to use JSX fragments with the 'jsxFactory' compiler option.`

I tried `"jsxFragmentFactory": "Fragment",` in tsconfig.json but of course no such Fragment is known nor exported from the `vhtml` import.

- Is it possible to support JSX fragments in VHTML?
- Is there any other way of storing multiple `` siblings as per the above example?