[changed] Updated express dev-dependency

Author: mtscout6

package.json

@@ -48,7 +48,7 @@
     "es5-shim": "^4.1.0",
     "eslint": "^0.18.0",
     "eslint-plugin-react": "^1.6.0",
-    "express": "^3.4.8",
+    "express": "^4.12.3",
     "extract-text-webpack-plugin": "^0.3.8",
     "file-loader": "^0.8.1",
     "fs-promise": "^0.3.1",