chore(package): update rollup to version 0.60.0 (#1809)

Author: greenkeeper[bot]

package.json

@@ -46,7 +46,7 @@
     "karma-sauce-launcher": "1.2.0",
     "local-web-server": "2.5.2",
     "markdown": "0.5.0",
-    "rollup": "0.59.4",
+    "rollup": "0.60.0",
     "rollup-plugin-babel": "3.0.4",
     "uglify-js": "3.4.0"
   },