chore(deps-dev): bump vuepress from 1.3.0 to 1.3.1

Bumps [vuepress](https://github.com/vuejs/vuepress/tree/HEAD/packages/vuepress) from 1.3.0 to 1.3.1.
- [Release notes](https://github.com/vuejs/vuepress/releases)
- [Changelog](https://github.com/vuejs/vuepress/blob/master/CHANGELOG.md)
- [Commits](https://github.com/vuejs/vuepress/commits/v1.3.1/packages/vuepress)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -66,7 +66,7 @@
         "svg-inline-loader": "0.8.2",
         "template-string-optimize-loader": "^3.0.0",
         "url-loader": "^3.0.0",
-        "vuepress": "1.3.0",
+        "vuepress": "1.3.1",
         "webpack": "^4.40.2",
         "webpack-cli": "3.3.11",
         "webpack-dev-server": "^3.8.1",