chore(package): update rollup to version 0.61.1

Closes #3

Author: greenkeeper[bot]

package.json

@@ -68,7 +68,7 @@
     "react-dom": "^16.3.2",
     "react-test-renderer": "^16.3.2",
     "regenerator-runtime": "^0.11.1",
-    "rollup": "^0.59.1",
+    "rollup": "^0.61.1",
     "rollup-plugin-babel": "^3.0.4",
     "rollup-plugin-commonjs": "^9.1.3",
     "rollup-plugin-json": "^3.0.0",