chore(deps): update dependency nuxt to v2.9.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
nuxt	devDependencies	minor	2.8.1 -> 2.9.0

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Release Notes

nuxt/nuxt.js

### [`v2.9.0`](https://togithub.com/nuxt/nuxt.js/compare/v2.8.1...v2.9.0) [Compare Source](https://togithub.com/nuxt/nuxt.js/compare/v2.8.1...v2.9.0)

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[codecov[bot]]

Codecov Report

Merging #60 into master will not change coverage. The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #60   +/-   ##
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  Coverage     100%   100%           
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  Files           2      2           
  Lines          45     45           
  Branches       11     11           
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  Hits           45     45