chore(package): update rollup to version 2.0.2

Closes #646

Author: greenkeeper[bot]

package.json

@@ -83,7 +83,7 @@
     "remark-preset-lint-travi": "^1.3.0",
     "remark-toc": "^7.0.0",
     "remark-usage": "^7.0.1",
-    "rollup": "^1.20.2",
+    "rollup": "^2.0.2",
     "rollup-plugin-babel": "^4.3.3",
     "sinon": "^9.0.0",
     "travis-lint": "^1.0.0",