Merge pull request #26 from scurker/greenkeeper/rollup-0.55.0

Update rollup to the latest version 🚀

Author: scurker

package.json

@@ -41,7 +41,7 @@
     "mocha": "^5.0.0",
     "nyc": "^11.0.2",
     "preact": "^8.1.0",
-    "rollup": "^0.54.0",
+    "rollup": "^0.55.0",
     "rollup-plugin-babel": "^3.0.1"
   },
   "bugs": {