Update react-async version in root.

Author: ghengeveld

package.json

@@ -68,7 +68,7 @@
     "prettier": "1.17.0",
     "prop-types": "^15.7.2",
     "react": "^16.9.0",
-    "react-async": "^7.0.4",
+    "react-async": "^8.0.0-alpha.0",
     "react-dom": "^16.9.0"
   }
 }