chore(deps): update dependency defu to v3

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
defu	dependencies	major	^2.0.4 -> ^3.1.0

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Release Notes

nuxt-contrib/defu

### [`v3.1.0`](https://togithub.com/nuxt-contrib/defu/blob/master/CHANGELOG.md#​310-httpsgithubcomnuxt-contribdefucomparev301v310-2020-08-04) [Compare Source](https://togithub.com/nuxt-contrib/defu/compare/v3.0.1...v3.1.0) ##### Features - add defu.arrayFn ([#​21](https://togithub.com/nuxt-contrib/defu/issues/21)) ([df05ed0](https://togithub.com/nuxt-contrib/defu/commit/df05ed04088d6e0f0bc1a8cd9603fae46fb59268)) ##### [3.0.1](https://togithub.com/nuxt-contrib/defu/compare/v3.0.0...v3.0.1) (2020-07-29) ##### Bug Fixes - recursively pass merger ([ec09394](https://togithub.com/nuxt-contrib/defu/commit/ec09394d77533cd0a4753a943a5d6fbd25ef308d)) ### [`v3.0.1`](https://togithub.com/nuxt-contrib/defu/blob/master/CHANGELOG.md#​301-httpsgithubcomnuxt-contribdefucomparev300v301-2020-07-29) [Compare Source](https://togithub.com/nuxt-contrib/defu/compare/v3.0.0...v3.0.1) ### [`v3.0.0`](https://togithub.com/nuxt-contrib/defu/blob/master/CHANGELOG.md#​300-httpsgithubcomnuxt-contribdefucomparev204v300-2020-07-28) [Compare Source](https://togithub.com/nuxt-contrib/defu/compare/v2.0.4...v3.0.0) ##### ⚠ BREAKING CHANGES - defau will merge arrays too ([#​18](https://togithub.com/nuxt-contrib/defu/issues/18)) ##### Features - extend and custom merger ([#​19](https://togithub.com/nuxt-contrib/defu/issues/19)) ([4932232](https://togithub.com/nuxt-contrib/defu/commit/493223278840132a6de2c3291b60f7b00b3fa477)) - merge arrays ([#​18](https://togithub.com/nuxt-contrib/defu/issues/18)) ([22c631e](https://togithub.com/nuxt-contrib/defu/commit/22c631e354d9bc50380ce7beb8914bd44feb2309)) ##### [2.0.4](https://togithub.com/nuxt-contrib/defu/compare/v2.0.3...v2.0.4) (2020-05-22) ##### Bug Fixes - correct path to types ([33d4bf0](https://togithub.com/nuxt-contrib/defu/commit/33d4bf0331e70b69a3a2a392f18a8f890d45d4f9)) ##### [2.0.3](https://togithub.com/nuxt-contrib/defu/compare/v2.0.2...v2.0.3) (2020-05-22) ##### Bug Fixes - specify type declaration file more precisely ([#​15](https://togithub.com/nuxt-contrib/defu/issues/15)) ([6aa47d4](https://togithub.com/nuxt-contrib/defu/commit/6aa47d4a06a117b34b5e9231b04f8403056c2685)) ##### [2.0.2](https://togithub.com/nuxt-contrib/defu/compare/v2.0.1...v2.0.2) (2020-04-19) ##### [2.0.1](https://togithub.com/nuxt-contrib/defu/compare/v2.0.0...v2.0.1) (2020-04-19) ##### Docs - Add note about `null`

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[codecov[bot]]

Codecov Report

Merging #396 into dev will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##               dev      #396   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           32        32           
  Branches        13        13           
=========================================
  Hits            32        32           

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