Add babel and build script

Author: rafgraph

package.json

@@ -4,6 +4,8 @@
   "description": "Hash link scroll functionality for React Router v4",
   "main": "lib/index.js",
   "scripts": {
+    "build": "rm -rf lib && babel src -d lib --presets=latest,react --plugins=transform-object-rest-spread",
+    "prepublish": "npm run build"
   },
   "repository": {
     "type": "git",
@@ -19,5 +21,11 @@
   "bugs": {
     "url": "https://github.com/rafrex/react-router-hash-link-scroll/issues"
   },
-  "homepage": "https://github.com/rafrex/react-router-hash-link-scroll#readme"
+  "homepage": "https://github.com/rafrex/react-router-hash-link-scroll#readme",
+  "devDependencies": {
+    "babel-cli": "^6.24.0",
+    "babel-plugin-transform-object-rest-spread": "^6.23.0",
+    "babel-preset-latest": "^6.24.0",
+    "babel-preset-react": "^6.23.0"
+  }
 }