Merge pull request #81 from microcmsio/doc/delete-unpkg

UNPKGの記載が残っていたため、jsdelivrに置き換え

Author: himorishige

README.md

@@ -44,7 +44,7 @@ or
 ```
 
 > [!WARNING]
-> The hosting service (unpkg.com) is not related to microCMS. For production use, we recommend self-hosting on your own server.
+> The hosting service (cdn.jsdelivr.net) is not related to microCMS. For production use, we recommend self-hosting on your own server.
 
 ### How to use