bump version

Author: Elliott Marquez

package-lock.json

@@ -26,7 +26,7 @@
     "generate-types": "gen-typescript-declarations --deleteExisting --outDir . --verify",
     "prepare": "npm run generate-types"
   },
-  "version": "3.0.2",
+  "version": "3.0.3",
   "author": "The Polymer Authors",
   "dependencies": {
     "@polymer/polymer": "^3.0.0"