chore(package): update rollup to version 0.60.0

Author: greenkeeper[bot]

package.json

@@ -70,7 +70,7 @@
     "prop-types": "^15.6.1",
     "react": "^16.4.0",
     "react-dom": "^16.4.0",
-    "rollup": "^0.59.4",
+    "rollup": "^0.60.0",
     "rollup-plugin-buble": "^0.19.2",
     "rollup-plugin-commonjs": "^9.1.3",
     "rollup-plugin-node-resolve": "^3.3.0",