chore(package): update rollup to version 0.35.15 (#64)

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -31,7 +31,7 @@
   "devDependencies": {
     "babel": "^6.5.2",
     "babel-preset-es2015-rollup": "^1.2.0",
-    "rollup": "^0.35.14",
+    "rollup": "^0.35.15",
     "rollup-plugin-babel": "^2.6.0",
     "rollup-plugin-commonjs": "^5.0.3",
     "rollup-plugin-node-resolve": "^2.0.0"