change at-rule plugin for postcss

Author: Scrum

gulpfile.babel.js

@@ -31,7 +31,7 @@ gulp.task('pss', () => {
         .pipe(postcss([
             require('postcss-import')(),
             require('postcss-mixins')(),
-            require('postcss-for-variables')(),
+            require('postcss-at-rules-variables')(),
             require('postcss-for')(),
             require('postcss-custom-properties')(),
             require('postcss-nested')(),

package.json

@@ -36,13 +36,14 @@
     "gulp-release-tasks": "0.0.3",
     "gulp-rename": "^1.2.2",
     "gulp-shell": "^0.4.3",
+    "postcss-at-rules-variables": "0.0.11",
     "postcss-banner": "^1.0.0",
     "postcss-calc": "^5.0.0",
+    "postcss-conditionals": "^2.0.0",
     "postcss-cssnext": "^2.1.0",
     "postcss-custom-properties": "^5.0.0",
     "postcss-extend": "^1.0.0",
     "postcss-for": "^2.0.0",
-    "postcss-for-variables": "0.0.1",
     "postcss-import": "^7.0.0",
     "postcss-mixins": "^1.0.1",
     "postcss-nested": "^1.0.0"