docs(README): add link to bpmn-io/bpmn-js

README.md

@@ -1,3 +1,7 @@
+> This project is still maintained but not actively developed anymore.
+> Checkout [bpmn-io/bpmn-js](https://github.com/bpmn-io/bpmn-js).
+
+
 camunda-bpmn.js
 ===============
 
@@ -95,4 +99,4 @@ After Grunt is installed you can use it like this:
 1. Run `grunt requirejs` to optimize and minify the JavaScript code into the `build/` folder.
 2. Run `grunt server watch` to start a web server at localhost:9000
 3. Open [localhost:9000/test/runner.html](http://localhost:9000/test/runner.html) to execute the jasmine tests in your browser while running the grunt server.
-4. Open [localhost:9000/demo.html](http://localhost:9000/demo.html) to see the demo.
+4. Open [localhost:9000/demo.html](http://localhost:9000/demo.html) to see the demo.