fix[build.js]: fixed build bug in preview mode #819

package.json

@@ -29,6 +29,7 @@
     "axios": "0.17.1",
     "clipboard": "1.7.1",
     "codemirror": "5.32.0",
+    "connect": "3.6.6",
     "driver.js": "0.5.2",
     "dropzone": "5.2.0",
     "echarts": "3.8.5",
@@ -42,6 +43,7 @@
     "normalize.css": "7.0.0",
     "nprogress": "0.2.0",
     "screenfull": "3.3.2",
+    "serve-static": "1.13.2",
     "showdown": "1.8.5",
     "simplemde": "1.11.2",
     "sortablejs": "1.7.0",
@@ -87,7 +89,6 @@
     "postcss-import": "11.0.0",
     "postcss-loader": "2.0.9",
     "postcss-url": "7.3.0",
-    "pushstate-server": "3.0.1",
     "rimraf": "2.6.2",
     "sass-loader": "6.0.6",
     "script-loader": "0.7.2",