chore(package): update dependencies (#109)

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -41,7 +41,7 @@
     "gh-release": "^2.2.1",
     "rollup": "^0.41.4",
     "rollup-plugin-babel": "^2.7.1",
-    "rollup-plugin-commonjs": "^7.0.0",
+    "rollup-plugin-commonjs": "^8.0.2",
     "rollup-plugin-node-resolve": "^2.0.0"
   }
 }