Fix a rogue NetworkOnMainThreadException

For some strange reason it has never happened before.

QuickPlay/Configuration.cs

@@ -187,11 +187,14 @@ namespace QuickPlay
             configUrl = url;
         }
         public async Task<PlayerConfiguration> GetConfigurationAsync()
+        {
+            return await Task.Run(async () =>
             {
                 var client = new HttpClient();
                 var resp = await client.GetStreamAsync(configUrl);
                 var sr = new StreamReader(resp);
                 return PlayerConfiguration.FromFile(sr);
+            });
         }
     }