No bsb output color

First I want to start by saying thanks for the great project and great contribution to Reason gamedev community. Thank you a lot! 🎂🎉🙌

I'm playing with different "bootstraps" and build systems around reprocessing and right now I'm trying your approach because I've felt in love with `create-react-app` in React world. I noticed that `bsb` output does not have colors. I had PR to `bsb-loader` that was fixing the same issue. It should be as easy as changing `bsb` command depending on platform. It should work without problem on macOS and Linux. Here is original PR I've done: https://github.com/reasonml-community/bs-loader/pull/29. It would be great to know what do you thing about it and if it's easy to implement.

Comece revisando como o comando bsb é invocado e compare-o com o pull request #29 referenciado do bs-loader. Verifique o comportamento específico do comando nas plataformas macOS e Linux e, em seguida, confirme que a saída do bsb inclui cores sem interromper o fluxo de build existente.

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