release 9.0, update of links

README.md

@@ -28,15 +28,18 @@ We even have [good first issues](https://github.com/graphhopper/graphhopper/issu
 
 To get started you can try [GraphHopper Maps](README.md#graphhopper-maps), read through our documentation and install the GraphHopper Web Service locally.
 
-* 8.x: [documentation](https://github.com/graphhopper/graphhopper/blob/8.x/docs/index.md)
-  , [web service jar](https://repo1.maven.org/maven2/com/graphhopper/graphhopper-web/8.0/graphhopper-web-8.0.jar)
-  , [announcement](https://www.graphhopper.com/blog/2023/10/18/graphhopper-routing-engine-8-0-released/)
+* 9.x: [documentation](https://github.com/graphhopper/graphhopper/blob/9.x/docs/index.md)
+  , [web service jar](https://repo1.maven.org/maven2/com/graphhopper/graphhopper-web/9.0/graphhopper-web-9.0.jar)
+  , [announcement](https://www.graphhopper.com/blog/2024/04/23/graphhopper-routing-engine-9-0-released)
 * unstable master: [documentation](https://github.com/graphhopper/graphhopper/blob/master/docs/index.md)
 
 <details><summary>Click to see older releases</summary>
 
 * See our [changelog file](./CHANGELOG.md) for Java API Changes.
 
+* 8.x: [documentation](https://github.com/graphhopper/graphhopper/blob/8.x/docs/index.md)
+  , [web service jar](https://repo1.maven.org/maven2/com/graphhopper/graphhopper-web/8.0/graphhopper-web-8.0.jar)
+  , [announcement](https://www.graphhopper.com/blog/2023/10/18/graphhopper-routing-engine-8-0-released/)
 * 7.x: [documentation](https://github.com/graphhopper/graphhopper/blob/7.x/docs/index.md)
   , [web service jar](https://repo1.maven.org/maven2/com/graphhopper/graphhopper-web/7.0/graphhopper-web-7.0.jar)
   , [announcement](https://www.graphhopper.com/blog/2023/03/14/graphhopper-routing-engine-7-0-released/)