message: Add note about named export to API docs
diff: @@ -7,7 +7,7 @@ import TypeScriptAdmonition from './_ts_admonition.md';
  <TypeScriptAdmonition />
  -The default export of `react-querybuilder` is the `<QueryBuilder />` React component.
  +The default export of `react-querybuilder` is the `<QueryBuilder />` React component (also available as a named export).
  All props are optional, but as stated in the [getting started guide](../intro), the query builder is really only useful when, at a minimum, the `fields` prop is defined.
  