Doesn't understand `{@const x = 42}` of Svelte v3.46.0

[tv42]

Svelte's latest release added @const to the template syntax. This plugin doesn't understand the new syntax and errors out.

https://github.com/sveltejs/svelte/blob/master/CHANGELOG.md#3460

npm run format
...
[error] src/routes/foo.svelte: Error: unknown node type: ConstTag
[error]     at Object.print (/home/blah/blah/node_modules/prettier-plugin-svelte/plugin.js:1328:11)
[error]     at callPluginPrintFunction (/home/blah/blah/node_modules/prettier/index.js:14259:21)

[tv42]

Thank you!