Bump version of sass

static/package.json

@@ -18,7 +18,7 @@
     "gulp-livereload": "^1.5.0",
     "gulp-load-plugins": "^0.5.3",
     "gulp-plumber": "^0.6.5",
-    "gulp-sass": "^1.0.0",
+    "gulp-sass": "^2.0.4",
     "gulp-size": "^0.3.1",
     "gulp-uglify": "^0.2.1",
     "gulp-uncss": "^0.4.5",