inertia@0.9.0

• Convert library to TypeScript (#592).
• Add check for FormData when determining if a visit includes files (#668).
• Fix mergeDataIntoQueryString method to not change the URL path (#556).
• Add new head manager, used by the new head components in the adapters (#652).

This is a breaking change, and requires that you also update to the latest adapter version:

• inertia-vue@0.6.0
• inertia-vue3@0.4.0
• inertia-react@0.6.0
• inertia-svelte@0.7.0