ci: add windows tests

[mrexox]

:zap: Summary

This PR will make sense after https://github.com/crystal-ameba/ameba/issues/368 is resolved

[coveralls-official[bot]]

Pull Request Test Coverage Report for Build 8606519973

Details

• 2 of 2 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.006%) to 93.854%

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Totals
Change from base Build 8605119769:	0.006%
Covered Lines:	901
Relevant Lines:	960

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💛 - Coveralls

[veelenga]

Hey, there. You can now give it a try (master branch for now).

[veelenga]

Ah, sorry, seems to be affected by https://github.com/crystal-lang/shards/pull/593

[littleforest]

superseded by #107