Updated appveyor.yml

Attempting to fix the MyGet symbol server URL

Author: leekelleher

appveyor.yml

@@ -24,8 +24,8 @@ artifacts:
 deploy:
     # MyGet Deployment for builds & releases
   - provider: NuGet
-    server: https://www.myget.org/F/umbraco-packages/
-    symbol_server: https://www.myget.org/F/umbraco-packages/symbols/
+    server: https://www.myget.org/F/umbraco-packages/api/v2/package
+    symbol_server: https://www.myget.org/F/umbraco-packages/symbols/api/v2/package
     api_key:
       secure: 36/Ax5O+e6wENlhoTwgvoEBZV3FG4XjF429SNTej2qsGTAL+cdfA1kT/tm1St8vx
     artifact: /.*\.nupkg/