double sourceMappingURL in output

[gmoulin]

Hi,
great job on this tool.

I have a problem with processors and a double sourceMappingURL (original + generated) in the output when using grunt-postcss.

The grunt configuration :

postcss: { //grunt-postcss
    options: {
        map: true,
        processors: [
            require('autoprefixer-core')({browsers: ['last 2 versions', 'ie 8', 'ie 9']}).postcss,
            require('css-mqpacker').postcss,
            require('csswring').postcss
        ]
    },
    // files
}          

And the output :

//rules
/*# sourceMappingURL=global.css.map */@media(min-width:768px){.header__logo{border-bottom-width:0;padding-bottom:20px}.body--scrolled .header__logo{display:block}.mobileNav{display:none}}
/*# sourceMappingURL=global.min.css.map */

If I remove "css-mqpacker" from the processor, no problem but I loose the media queries merging.
I tried to put it before autoprefixer, after csswring, same bug.

I have created an issue on postcss repository too (#106).

[ai]

@hail2u by specs sourceMappingURL comment should be last

[hail2u]

Thanks! I don't know Source Map comment position restricted to the end of file.