fix(deps): update dependency @nuxtjs/composition-api to v0.18.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@nuxtjs/composition-api	0.17.0 -> 0.18.0

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Release Notes

nuxt-community/composition-api

### [`v0.18.0`](https://togithub.com/nuxt-community/composition-api/blob/master/CHANGELOG.md#​0180-httpsgithubcomnuxt-communitycomposition-apicompare01700180-2021-01-08) [Compare Source](https://togithub.com/nuxt-community/composition-api/compare/0.17.0...0.18.0) ##### ⚠ BREAKING CHANGES - upgrade `@vue/composition-api` ##### Miscellaneous Chores - upgrade `@vue/composition-api` ([a8fa46d](https://togithub.com/nuxt-community/composition-api/commit/a8fa46d74d00d84ee0055dc444b07aa0ad2dbbdf))

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