chore(package): update rollup to version 0.64.1

Closes #25

Author: greenkeeper[bot]

package.json

@@ -91,7 +91,7 @@
     "postcss-strip-inline-comments": "0.1.5",
     "pump": "3.0.0",
     "raw-loader": "0.5.1",
-    "rollup": "^0.63.5",
+    "rollup": "^0.64.1",
     "rollup-plugin-commonjs": "9.1.3",
     "rollup-plugin-node-resolve": "^3.3.0",
     "rollup-plugin-sourcemaps": "^0.4.2",