chore(deps): update dependency nuxt to v2.9.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
nuxt	devDependencies	patch	2.9.0 -> 2.9.1

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Release Notes

nuxt/nuxt.js

### [`v2.9.1`](https://togithub.com/nuxt/nuxt.js/releases/v2.9.1) [Compare Source](https://togithub.com/nuxt/nuxt.js/compare/v2.9.0...v2.9.1) ##### 🐛 Bug Fixes - `vue-app` - [#​6252](https://togithub.com/nuxt/nuxt.js/issues/6252) Provide typescript backward compatibility - `loading-screen` - [nuxt/loading-screen#​38](https://togithub.com/nuxt/loading-screen/issues/38) set `Content-Type` for index page ##### 📝 Examples - `CoffeeScript` - [#​6248](https://togithub.com/nuxt/nuxt.js/issues/6248) Update module for using `additionalExtensions` ##### 💖 Thanks to - Artyom Bogomolov ([@​DevArtyom](https://togithub.com/DevArtyom)) - Rafał Chłodnicki ([@​rchl](https://togithub.com/rchl))

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[codecov[bot]]

Codecov Report

Merging #61 into master will not change coverage. The diff coverage is n/a.

@@          Coverage Diff          @@
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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