update appveyor webhook to the live Duga url

Author: Zomis

appveyor.yml

@@ -3,9 +3,7 @@ build:
   verbosity: normal
 notifications:
 - provider: Webhook
-  url: http://stats.zomis.net:8081/hooks/appveyor?roomId=14929
-  headers:
-    X-Duga-Event: duga42
+  url: http://stats.zomis.net/hooks/appveyor?roomId=14929
   on_build_success: true
   on_build_failure: true
   on_build_status_changed: true