chore(package): update rollup to version 2.0.6

Closes #94

Author: greenkeeper[bot]

package.json

@@ -71,7 +71,7 @@
     "react": "^16.6.3",
     "react-dom": "^16.6.3",
     "react-test-renderer": "^16.6.3",
-    "rollup": "^1.16.2",
+    "rollup": "^2.0.6",
     "rollup-plugin-babel": "^4.0.3",
     "rollup-plugin-replace": "^2.1.0",
     "rollup-plugin-terser": "^3.0.0"