add vue-styleguidist

package.json

@@ -84,6 +84,7 @@
     "url-loader": "0.6.2",
     "vue-loader": "13.5.0",
     "vue-style-loader": "3.0.3",
+    "vue-styleguidist": "^1.4.6",
     "vue-template-compiler": "2.5.10",
     "webpack": "3.10.0",
     "webpack-bundle-analyzer": "2.9.1",