new Grafana version and adjust to personal needs

Signed-off-by: Andreas Schmid <service@aaschmid.de>

grafana/README.md

@@ -1,8 +1,6 @@
 # Grafana dashboard working with this exporter
 
 This dashboard is based on the following dashboard:
-https://grafana.com/grafana/dashboards/713
+https://grafana.com/grafana/dashboards/12579
 
-Instead of influx it uses prometheus and has been modified and enhanced.
+Adjusted to my personal max down- and upstream and upgraded to the newest grafana version.
-
-The dashboard is now also published to [Grafana](https://grafana.com/grafana/dashboards/12579)