Update Azure Maps to V3 (#83)

Author: cschotte

README.md

@@ -16,11 +16,11 @@ You will need to add the atlas script and css files as well as the script genera
 
 
 ```
-<link rel="stylesheet" href="https://atlas.microsoft.com/sdk/javascript/mapcontrol/2/atlas.min.css" type="text/css" />
+<link href="https://atlas.microsoft.com/sdk/javascript/mapcontrol/3/atlas.min.css" rel="stylesheet" />
 ```
 
 ```
-<script src="https://atlas.microsoft.com/sdk/javascript/mapcontrol/2/atlas.min.js"></script>
+<script src="https://atlas.microsoft.com/sdk/javascript/mapcontrol/3/atlas.min.js"></script>
 <script src="_content/AzureMapsControl.Components/azure-maps-control.js"></script>
 ```