Update dependency gulp-rename to v2

Author: renovate-bot

package.json

@@ -32,7 +32,7 @@
     "del": "^2.2.2",
     "gulp": "^3.9.1",
     "gulp-image-resize": "^0.12.0",
-    "gulp-rename": "^1.2.2",
+    "gulp-rename": "2.0.0",
     "gulp-sass": "^3.1.0",
     "gulp-uglify": "^3.0.0"
   }