chore(package): update rollup-plugin-commonjs to version 3.3.1 (#25)

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -33,7 +33,7 @@
     "babel-preset-es2015-rollup": "^1.1.1",
     "rollup": "^0.34.1",
     "rollup-plugin-babel": "^2.6.0",
-    "rollup-plugin-commonjs": "^3.3.0",
+    "rollup-plugin-commonjs": "^3.3.1",
     "rollup-plugin-node-resolve": "^1.7.1"
   }
 }