Do not notify AppVeyor on_build_status_changed

Similar to 4fb6643f31. This is motivated by the lack of the same feature in GitHub Actions.
2019-12-31 15:58:06 -08:00 · 2019-12-31 15:58:06 -08:00 · ab9f56b615
--- a/appveyor.yml
+++ b/appveyor.yml
@ -94,4 +94,4 @@ notifications:
      {{/isPullRequest}}
    on_build_success: false
    on_build_failure: true
-    on_build_status_changed: true
+    on_build_status_changed: false