grunt-contrib-cssmin
                                
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                        Update cssmin.js
Added callback to CleanCSS.minify function
I got this warning every time I used grunt-contrib-cssmin to combine multiple css files:
>> Ignoring remote @import of "https://fonts.googleapis.com/css?family=Roboto:300,400,400i,500,700,700i|Montserrat:400,700" as no callback given.
So I added the callback, and it works!! :+1:
/CC @shama @vladikoff
/CC @jakubpawlowicz: is this still valid with v4?
Is this going to be merged? This is still an issue
This needs a test case to verify the fix.