Update README.md

[andyhasit]

Updated README to show wrapping of done in a function.
This. solves issues like this: Swiip/generator-gulp-angular#498

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[pkozlowski-opensource]

This is not a correct change, see #18 for more details.

[andyhasit]

Indeed, I hadn't thought about that, though am aware of the issue of CI relying on proper return codes. I suppose this makes my suggestion a hack for personal use cases, and therefore doesn't belong in the README.