Merge pull request #56 from FullHuman/greenkeeper/rollup-0.67.0

Update rollup to the latest version 🚀

Author: jsnanigans

package.json

@@ -52,7 +52,7 @@
     "jest": "^23.5.0",
     "mini-css-extract-plugin": "^0.4.0",
     "prettier": "^1.14.0",
-    "rollup": "^0.66.0",
+    "rollup": "^0.67.0",
     "rollup-plugin-babel": "^4.0.1",
     "rollup-plugin-commonjs": "^9.1.3",
     "rollup-plugin-node-resolve": "^3.3.0",