Fix npm publish

Author: Joel Denning

package.json

@@ -1,6 +1,6 @@
 {
   "name": "single-spa-angular",
-  "version": "10.0.0-beta.1",
+  "version": "10.0.0-beta.2",
   "type": "module",
   "description": "Lifecycle function implementation for single-spa applications/parcels that use Angular 19 or greater",
   "scripts": {
@@ -16,6 +16,9 @@
       "types": "./lib/single-spa-angular.d.ts"
     }
   },
+  "files": [
+    "lib"
+  ],
   "keywords": [
     "single-spa",
     "angular",