[CI] produce artefacts only for master branch builds

[MomoDeve]

Appveyor has a storage limit of 50GB,each build wastes ~2GB

[MomoDeve]

@fall2019 CI fails because it cannot upload artifacts. Can you disable them for now? Later we need to think how to reduce produced size of archive as seems like AppVeyor has some storage limitations

[fall2019]

Oh sorry about that. I will do the job later tonight.

[MomoDeve]

Thanks!

[fall2019]

@fall2019 CI fails because it cannot upload artifacts. Can you disable them for now? Later we need to think how to reduce produced size of archive as seems like AppVeyor has some storage limitations

#90