chore(package): update rollup to version 0.57.1

Closes #6

Author: greenkeeper[bot]

package.json

@@ -110,7 +110,7 @@
     "react-dom": "^16.2.0",
     "replace-in-file": "^3.0.0-beta.2",
     "rimraf": "^2.6.1",
-    "rollup": "^0.56.3",
+    "rollup": "^0.57.1",
     "rollup-plugin-commonjs": "^9.0.0",
     "rollup-plugin-node-resolve": "^3.0.0",
     "rollup-plugin-sourcemaps": "^0.4.2",