geocode url lower case

https://github.com/Esri/route-planner-csharp/issues/14

In C:\ProgramData\RoutePlanner\services.xml, the line:

https://geocode.arcgis.com/ArcGIS/services
Should be:
https://geocode.arcgis.com/arcgis/services

(note how arcgis is not capitalized).

Otherwise, an error message will appear