chore(package): update rollup to version 2.0.2

Closes #55

Author: greenkeeper[bot]

package.json

@@ -64,7 +64,7 @@
     "minami": "^1.2.3",
     "mini-css-extract-plugin": "^0.4.4",
     "rimraf": "^2.6.2",
-    "rollup": "^1.25.1",
+    "rollup": "^2.0.2",
     "rollup-plugin-babel": "^4.3.3",
     "rollup-plugin-commonjs": "^10.1.0",
     "rollup-plugin-copy": "^3.1.0",