Update readme for 5.1 again

Author: easbar

README.md

@@ -78,7 +78,7 @@ To get started you can try [GraphHopper Maps](README.md#graphhopper-maps), read
 To install the [GraphHopper Maps](https://graphhopper.com/maps/) UI and the web service locally you [need a JVM](https://adoptopenjdk.net/) (>= Java 8) and do:
 
 ```bash
-wget https://github.com/graphhopper/graphhopper/releases/download/5.0/graphhopper-web-5.0.jar https://raw.githubusercontent.com/graphhopper/graphhopper/5.x/config-example.yml http://download.geofabrik.de/europe/germany/berlin-latest.osm.pbf
+wget https://github.com/graphhopper/graphhopper/releases/download/5.1/graphhopper-web-5.1.jar https://raw.githubusercontent.com/graphhopper/graphhopper/5.x/config-example.yml http://download.geofabrik.de/europe/germany/berlin-latest.osm.pbf
 java -Ddw.graphhopper.datareader.file=berlin-latest.osm.pbf -jar *.jar server config-example.yml
 ```