chore(package): update rollup to version 0.55.5

Closes #124

Author: greenkeeper[bot]

package.json

@@ -82,7 +82,7 @@
     "karma-sourcemap-loader": "0.3.7",
     "karma-webpack": "2.0.9",
     "npm-run-all": "4.1.2",
-    "rollup": "0.55.3",
+    "rollup": "0.55.5",
     "rollup-plugin-node-resolve": "3.0.2",
     "rollup-plugin-sourcemaps": "0.4.2",
     "rollup-plugin-uglify": "3.0.0",