[changed] Update fs-extra. Dev dependency.

Author: AlexKVal

package.json

@@ -59,7 +59,7 @@
     "express": "^4.12.3",
     "extract-text-webpack-plugin": "^0.8.0",
     "file-loader": "^0.8.1",
-    "fs-extra": "^0.19.0",
+    "fs-extra": "^0.20.0",
     "fs-promise": "^0.3.1",
     "glob": "^5.0.10",
     "http-proxy": "^1.11.1",