Npm scripts on Windows

[alfechner]

The scripts you provided in your example package.json file don't work for me on windows. They don't work with the single quoted path's.

I had to change i.e.

"extract:messages": "react-intl-cra 'src/**/*.js' -o 'output/messages.json'",

to something like

"extract:messages": "react-intl-cra src/**/*.js -o output/messages.json".

Besides that, everything works perfectly. Thank you for this great package.