chore(package): update rollup to version 2.0.6

Closes #48

Author: greenkeeper[bot]

package.json

@@ -94,7 +94,7 @@
     "portscanner": "^2.1.1",
     "qunitjs": "^2.4.1",
     "rimraf": "^2.6.2",
-    "rollup": "^1.9.3",
+    "rollup": "^2.0.6",
     "rollup-plugin-babel": "^4.3.2",
     "rollup-plugin-commonjs": "^9.3.4",
     "rollup-plugin-json": "^4.0.0",