chore(package): update rollup to version 0.64.0

Author: greenkeeper[bot]

package.json

@@ -50,7 +50,7 @@
     "jest": "^23.4.2",
     "mini-css-extract-plugin": "^0.4.0",
     "prettier": "^1.14.0",
-    "rollup": "^0.63.0",
+    "rollup": "^0.64.0",
     "rollup-plugin-babel": "^3.0.4",
     "rollup-plugin-commonjs": "^9.1.3",
     "rollup-plugin-node-resolve": "^3.3.0",