Update npm prepublish to run lint and build

Author: ericf

package.json

@@ -24,7 +24,7 @@
     "build": "babel-plugin build",
     "push": "babel-plugin publish",
     "test": "babel-plugin test",
-    "prepublish": "npm run build"
+    "prepublish": "npm run lint && npm run build"
   },
   "keywords": [
     "babel-plugin",