Updating symbol server to use MyGet

Author: Jeavon

appveyor.yml

@@ -35,7 +35,7 @@ deploy:
      # MyGet Deployment for builds & releases
   - provider: NuGet
     server: https://www.myget.org/F/umbracofilesystemproviders-azure/api/v2/package
-    symbol_server: https://nuget.symbolsource.org/MyGet/umbracofilesystemproviders-azure
+    symbol_server: https://www.myget.org/F/umbracofilesystemproviders-azure/symbols/api/v2/package
     api_key:
       secure: fz0rUrt3B1HczUC1ZehwVsrFSWX9WZGDQoueDztLte9/+yQG+BBU7UrO+coE8lUf
     artifact: /.*\.nupkg/