chore(package): update rollup to version 2.11.2

Closes #203

Author: greenkeeper[bot]

package.json

@@ -85,7 +85,7 @@
     "ramda-adjunct": "2.9.0",
     "rimraf": "2.6.2",
     "rimraf-promise": "2.0.0",
-    "rollup": "0.60.7",
+    "rollup": "2.11.2",
     "rollup-plugin-commonjs": "9.1.3",
     "rollup-plugin-node-resolve": "3.3.0",
     "sinon": "6.0.0",