fix: export correct types file (#49)

Author: eglitise

package.json

@@ -70,5 +70,5 @@
     "tsx": "^4.21.0",
     "typescript": "^5.1.6"
   },
-  "types": "./build/lib/types.d.ts"
+  "types": "./build/lib/asyncbox.d.ts"
 }