chore(package): update rollup to version 0.41.4

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -37,7 +37,7 @@
     "underscore": "1.8.3",
     "jsdoc-to-markdown": "^2.0.1",
     "markdown-doctest": "^0.9.1",
-    "rollup": "^0.41.3"
+    "rollup": "^0.41.4"
   },
   "contributors": [
     {