fix: limit files included in the package to only source files

Co-authored-by: Julie Van Kirk <[email protected]>
Co-authored-by: Douglas Johnson <[email protected]>

Author: 3 people

package.json

@@ -57,6 +57,10 @@
       "."
     ]
   },
+  "files": [
+    "index.js",
+    "lib/"
+  ],
   "publishConfig": {
     "access": "public",
     "provenance": true