docs: update casing

[realguse]

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A miniature PR that updates the "alt" tag for the license badge in the readme from "license" to "License". This is to match the second badge which has the name "Chat"

[changeset-bot]

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Latest commit: a74377e

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[svelte-docs-bot]

Preview: https://svelte-dev-git-preview-svelte-15321-svelte.vercel.app/