fix(deps): update vuepress monorepo to v1.3.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
@vuepress/plugin-back-to-top	dependencies	patch	1.3.0 -> 1.3.1
@vuepress/plugin-google-analytics	dependencies	patch	1.3.0 -> 1.3.1
@vuepress/plugin-pwa	dependencies	patch	1.3.0 -> 1.3.1
vuepress	devDependencies	patch	1.3.0 -> 1.3.1

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Release Notes

vuejs/vuepress

### [`v1.3.1`](https://togithub.com/vuejs/vuepress/blob/master/CHANGELOG.md#httpsgithubcomvuejsvuepresscomparev131v-2020-02-20) [Compare Source](https://togithub.com/vuejs/vuepress/compare/v1.3.0...v1.3.1) ##### Bug Fixes - **$core:** resolve jsx files by default (close [#​2058](https://togithub.com/vuejs/vuepress/issues/2058)) ([#​2059](https://togithub.com/vuejs/vuepress/issues/2059)) ([f083d8d](https://togithub.com/vuejs/vuepress/commit/f083d8d)) - **$core:** transpile vuepress packages and md files (close [#​1606](https://togithub.com/vuejs/vuepress/issues/1606), [#​1990](https://togithub.com/vuejs/vuepress/issues/1990)) ([#​2064](https://togithub.com/vuejs/vuepress/issues/2064)) ([0ca620f](https://togithub.com/vuejs/vuepress/commit/0ca620f)) - **$plugin-pwa:** popup component does not work (close [#​2172](https://togithub.com/vuejs/vuepress/issues/2172)) ([#​2187](https://togithub.com/vuejs/vuepress/issues/2187)) ([560b3c6](https://togithub.com/vuejs/vuepress/commit/560b3c6)) - **$theme-default:** non-ASCII hash causes wrong sidebar highlight (close [#​2078](https://togithub.com/vuejs/vuepress/issues/2078))([#​2166](https://togithub.com/vuejs/vuepress/issues/2166)) ([ca3679c](https://togithub.com/vuejs/vuepress/commit/ca3679c)) ##### Features - **$core:** support async enhanceApp (close [#​2074](https://togithub.com/vuejs/vuepress/issues/2074)) ([#​2075](https://togithub.com/vuejs/vuepress/issues/2075)) ([2d53fbb](https://togithub.com/vuejs/vuepress/commit/2d53fbb))

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