Update dependency gulp-rename to v2

Author: renovate-bot

package.json

@@ -30,7 +30,7 @@
     "gulp-autoprefixer": "7.0.1",
     "gulp-babel": "8.0.0",
     "gulp-postcss": "8.0.0",
-    "gulp-rename": "1.4.0",
+    "gulp-rename": "2.0.0",
     "gulp-sass": "4.0.2",
     "gulp-uglify": "3.0.2",
     "postcss-cssnext": "3.1.0"