chore(package): update rollup to version 2.0.6

Closes #189

Author: greenkeeper[bot]

package.json

@@ -70,7 +70,7 @@
     "jquery": "^3.1.0",
     "node-qunit-phantomjs": "^2.0.0",
     "qunit": "^2.4.1",
-    "rollup": "^1.27.13",
+    "rollup": "^2.0.6",
     "rollup-plugin-babel": "^4.0.1",
     "rollup-plugin-cleanup": "^3.0.0",
     "rollup-plugin-commonjs": "^10.0.0",