Update dependency vuepress to v2.0.0-rc.0 (#594)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [vuepress](https://togithub.com/vuejs/vuepress) | [`2.0.0-beta.68` ->
`2.0.0-rc.0`](https://renovatebot.com/diffs/npm/vuepress/2.0.0-beta.68/2.0.0-rc.0)
|
[![age](https://developer.mend.io/api/mc/badges/age/npm/vuepress/2.0.0-rc.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/vuepress/2.0.0-rc.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/vuepress/2.0.0-beta.68/2.0.0-rc.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/vuepress/2.0.0-beta.68/2.0.0-rc.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

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