Update node-sass to 4.x to support alpine users

[mrfelton]

OS?

Alpine Linux

Versions.

angular-cli: 1.0.0-beta.22

Mention any other details that might be useful.

As of node-saas 4.1.0, node-saas now provides a pre-built binary for Alpine Linux. We should update to this version to better support our Alpine user base.

[filipesilva]

Would you be interested in opening a PR for it? These two files are the ones you need to update:

• https://github.com/angular/angular-cli/blob/master/package.json
• https://github.com/angular/angular-cli/blob/master/packages/angular-cli/package.json

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