text/xml to application/xml

src/Serilog.Sinks.ElmahIo/Sinks/ElmahIo/ElmahIOSink.cs

@@ -464,7 +464,7 @@ internal void CreateInstallation()
                         {
                             Name = Path.GetFileName(configPath),
                             Content = outputXml.ToString(),
-                            ContentType = "text/xml"
+                            ContentType = "application/xml"
                         });
                     }
                 }