structured data isn't inserted into build

[martinloretzzz]

Structured Data isn't inserted into the static build when using "react-navi-helmet-async".
The problem is, that ${helmet.script && helmet.script.toString()} is missing in

navi/packages/react-navi/create-react-app.js

Lines 90 to 95 in d76b41e

	metaHTML = `
	${(helmet.title && helmet.title.toString()) ||
	'<title>' + route.title + '</title>'}
	${helmet.meta && helmet.meta.toString()}
	${helmet.link && helmet.link.toString()}
	`