chore(package): update rollup to version 0.60.3

Closes #2

Author: greenkeeper[bot]

package.json

@@ -2,7 +2,7 @@
   "name": "svelte-app",
   "version": "1.0.0",
   "devDependencies": {
-    "rollup": "^0.57.1",
+    "rollup": "^0.60.3",
     "rollup-plugin-buble": "^0.19.2",
     "rollup-plugin-commonjs": "^9.1.0",
     "rollup-plugin-node-resolve": "^3.0.0",