chore: fix accidently delete fs.realpath package

Author: kieronqtran

package.json

@@ -62,6 +62,7 @@
     "expose-loader": "^0.7.1",
     "file-loader": "^0.8.5",
     "fs-extra": "^0.30.0",
+    "fs.realpath": "^1.0.0",
     "glob": "^7.0.3",
     "handlebars": "^4.0.5",
     "html-webpack-plugin": "^2.19.0",