Add note about project future

tobyzerner · web-flow · commit ff381ed89bcf · 2021-03-04T21:08:05.000+10:30
diff --git a/README.md b/README.md
@@ -10,6 +10,8 @@
 
 Works with version 1.0 of the spec.
 
+**⚠️ The project is no longer maintained.** Check out [tobyzerner/json-api-server](https://github.com/tobyzerner/json-api-server) instead.
+
 ## Install
 
 via Composer:
