Handle spaces in path only on Windows

[vinocher-bc]

Fixes #39

Handle spaces in path only on Windows to prevent breaking Linux and macOS, because only the Windows code path, which calls spawnSync with shell:true, needs this.

[tristanlabelle]

@vknabel , what's the process for publishing a release? I see you added the workflow, do I just use "draft a new release" from here and replicate the format you used previously, and that will kick off the workflow?

[vknabel]

@tristanlabelle sorry for not describing yet.

• bump the version in the package.json
• Create a tag (vX.X.X)
• Publish it as release in github
• You can just autogenerate the release notes

Update: now mentioned in CONTRIBUTING.md