chore(package): update rollup to version 0.48.0 (#2149)

package.json

@@ -60,7 +60,7 @@
     "node-sass": "^4.5.3",
     "node-static": "^0.7.9",
     "nodemon": "^1.11.0",
-    "rollup": "^0.47.4",
+    "rollup": "^0.48.0",
     "rollup-plugin-babel": "^3.0.0",
     "uglify-js": "^3.0.15",
     "watchify": "^3.9.0"