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Added null to paren union type of render (#937)

This is require because when TypeScript has `strictNullChecks` set to true, in tsconfig.json, it errors out.

e.g.

```
import { render, h } from 'preact';
import TodoList from './components/todo-list';

const root = document.getElementById('root');

render(<TodoList />, root);
```

results in

```
TS2345: Argument of type 'HTMLElement | null' is not assignable to parameter of type 'Document | Element'.
  Type 'null' is not assignable to type 'Document | Element'.
```

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