Fix Windows sourcemap paths.

[XhmikosR]

Refs #7.

/CC @lahmatiy

[XhmikosR]

Ping @lahmatiy. There's also twbs/bootstrap#27811 (comment)

[lahmatiy]

Sorry for delay with response. I fixed problem by myself since it has one more issue to fix (see d162d06).
Thank you!

[XhmikosR]

NP, I'll test it out in the next release :)

[lahmatiy]

Published as 2.0.1 (https://github.com/css/csso-cli/releases/tag/v2.0.1)

[XhmikosR]

@lahmatiy: the slashes issue is fixed. But I still see another issue in Bootstrap, see my comment twbs/bootstrap#27811 (comment)

[XhmikosR]

Maybe it's not a bug, I don't know, but I couldn't get your attention in the PR.

[lahmatiy]

@XhmikosR Sorry, I thought the PR is about paths issue, therefore I did not look deeper. Will take a look!

[XhmikosR]

@lahmatiy: NP, and thanks for taking a look. BTW I was wondering, why doesn't csso expose the source map API so that we don't reinvent the wheel here?