chore(deps): update peerdependency vuepress to ^1.0.4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
vuepress	peerDependencies	patch	^1.0.3 -> ^1.0.4

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Release Notes

vuejs/vuepress

### [`v1.0.4`](https://togithub.com/vuejs/vuepress/blob/master/CHANGELOG.md#httpsgithubcomvuejsvuepresscomparev104v-2019-09-06) [Compare Source](https://togithub.com/vuejs/vuepress/compare/v1.0.3...v1.0.4) ##### Bug Fixes - **$core:** do not transpile core packages' dependencies ([b69b107](https://togithub.com/vuejs/vuepress/commit/b69b107)) - **avatar:** fix url ([45e31b4](https://togithub.com/vuejs/vuepress/commit/45e31b4)) - **contributors:** fix for good contributions ([a709a4f](https://togithub.com/vuejs/vuepress/commit/a709a4f)) - **contributors:** fix url parameters ([db71238](https://togithub.com/vuejs/vuepress/commit/db71238)) - add missing hash in [#​1706](https://togithub.com/vuejs/vuepress/issues/1706) ([#​1780](https://togithub.com/vuejs/vuepress/issues/1780)) ([25777e4](https://togithub.com/vuejs/vuepress/commit/25777e4)) - contributors commit link ([#​1809](https://togithub.com/vuejs/vuepress/issues/1809)) ([bb61182](https://togithub.com/vuejs/vuepress/commit/bb61182)) ##### Features - **$core:** use any custom protocol for outboundRE ([#​1731](https://togithub.com/vuejs/vuepress/issues/1731)) ([120d885](https://togithub.com/vuejs/vuepress/commit/120d885)) - Disable next and prev links from global config ([#​1761](https://togithub.com/vuejs/vuepress/issues/1761)) ([92a1c02](https://togithub.com/vuejs/vuepress/commit/92a1c02))

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