Add missing angle bracket (#4178)

Author: skyf0l

packages/utils/package.json

@@ -71,7 +71,7 @@
   "publishConfig": {
     "access": "public"
   },
-  "author": "Heath Chiavettone <[email protected]",
+  "author": "Heath Chiavettone <[email protected]>",
   "contributors": [],
   "keywords": [
     "react-jsonschema-form",