chore(package): update rollup to version 2.0.3

Closes #106

Author: greenkeeper[bot]

package.json

@@ -89,7 +89,7 @@
     "postcss-strip-inline-comments": "^0.1.5",
     "pump": "^3.0.0",
     "raw-loader": "^1.0.0",
-    "rollup": "^1.15.3",
+    "rollup": "^2.0.3",
     "rollup-plugin-commonjs": "^9.2.0",
     "rollup-plugin-node-resolve": "^4.2.4",
     "rollup-plugin-sourcemaps": "^0.4.2",