Bump vuepress from 0.14.11 to 1.2.0

Bumps [vuepress](https://github.com/vuejs/vuepress/tree/HEAD/packages/vuepress) from 0.14.11 to 1.2.0.
- [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/v1.2.0/packages/vuepress)

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

package.json

@@ -80,7 +80,7 @@
     "vue-loader": "^15.0.0",
     "vue-style-loader": "^4.1.2",
     "vue-template-compiler": "^2.5.2",
-    "vuepress": "^0.14.11",
+    "vuepress": "^1.2.0",
     "webpack": "^4.0.0",
     "webpack-cli": "^3.1.2",
     "webpack-merge": "^4.1.0"