chore(package): update rollup to version 0.63.5

Closes #14

Author: greenkeeper[bot]

package.json

@@ -56,7 +56,7 @@
     "http-server": "^0.11.1",
     "npm-run-all": "^4.1.3",
     "nyc": "^12.0.2",
-    "rollup": "^0.62.0",
+    "rollup": "^0.63.5",
     "rollup-plugin-babel": "^3.0.7",
     "strip-ansi": "^4.0.0"
   },