module.exports = {

  target: {
    files: [{
      expand: true,
      cwd: '<%= destCSSDir %>' + '/',
      src: '*.css',
      dest: '<%= destCSSDir %>' + '/',
      ext: '.min.css'
    }]
  }
};

@@ -12,16 +12,53 @@
 rts = %7B%0A
+  options: %7B%0A    sourceMap: true%0A  %7D,
 %0A  targe

Add source maps support