do code splitting

Author: sw-yx

package.json

@@ -2,9 +2,8 @@
   "name": "react-netlify-identity-widget",
   "version": "0.0.23",
   "main": "dist/index.js",
-  "umd:main": "dist/reactNetlifyIdentityWidget.umd.production.js",
-  "module": "dist/reactNetlifyIdentityWidget.es.production.js",
-  "typings": "dist/index.d.ts",
+  "module": "dist/reactNetlifyIdentityWidget.es.production/index.js",
+  "typings": "dist/reactNetlifyIdentityWidget.es.production/src/index.d.ts",
   "files": [
     "dist",
     "styles.css"