message: Move deps to devDeps
diff: "license": "MIT",
  "devDependencies": {
  "vuepress": "^1.5.3",
  - "vuepress-theme-yuu": "^2.3.0"
  - },
  - "dependencies": {
  + "vuepress-theme-yuu": "^2.3.0",
  "@vuepress/plugin-back-to-top": "^1.7.1",
  "@vuepress/plugin-medium-zoom": "^1.7.1"
  }
  