Plugin files array needs updating

[spacebeers]

I installed the plugin to help a college out with some sass refactoring and we got an error every time we tried to run it.

I got it working locally by changing line 35 of size.js from

grunt.log.write(sizeBuilder.build(this.file.src));

to

this.files.forEach(function(file) {
grunt.log.write(sizeBuilder.build(file.src));
});

I've forked the repo and put my change in, but that's it and now it looks like I've just copied your work when I just wanted to get it working :)

I'm a bit new to using GitHub.

[okor]

This bug still exists. Please consider accepting the pull request.