AppVeyor: Remove os: unstable

The default os has Qt now, so there no need for the unstable os.
11 years ago · 55725f07ec
1 changed files with 0 additions and 3 deletions
--- a/appveyor.yml
+++ b/appveyor.yml
@ -1,6 +1,3 @@
 # it seems that Qt is only installed by default on unstable os at the moment
 os: unstable
 # shallow clone
 clone_depth: 5