Update appveyor.yml
Update appveyor.yml

Temporary downgrade build image because of "Chrome have not captured in 60000 ms, killing."
AlekseyMartynov/DevExtreme.AspNet.Data,DevExpress/DevExtreme.AspNet.Data,AlekseyMartynov/DevExtreme.AspNet.Data,DevExpress/DevExtreme.AspNet.Data,DevExpress/DevExtreme.AspNet.Data,DevExpress/DevExtreme.AspNet.Data,AlekseyMartynov/DevExtreme.AspNet.Data,AlekseyMartynov/DevExtreme.AspNet.Data