fix prepublish script name

package.json

@@ -15,7 +15,7 @@
     "nodeunit": "nodeunit",
     "test": "nodeunit tests",
     "build": "rimraf dist && babel src -d dist",
-    "prebublish": "npm run test && npm run build && npm run createPackageJson",
+    "prepublish": "npm run test && npm run build && npm run createPackageJson",
     "publish": "cd dist && npm publish"
   },
   "keywords": [