Add a republish script

Author: sergiodxa

package.json

@@ -4,7 +4,8 @@
   "description": "A High-Order Component to connect React and Socket.io",
   "main": "build/index.js",
   "scripts": {
-    "build": "babel lib --out-dir build"
+    "build": "babel lib --out-dir build",
+    "prepublish": "npm run build"
   },
   "repository": {
     "type": "git",