chore(package): update rollup-plugin-commonjs to version 9.1.3

Closes #19

Author: greenkeeper[bot]

package.json

@@ -95,7 +95,7 @@
     "pump": "3.0.0",
     "raw-loader": "0.5.1",
     "rollup": "0.58.2",
-    "rollup-plugin-commonjs": "9.1.0",
+    "rollup-plugin-commonjs": "9.1.3",
     "rollup-plugin-node-resolve": "3.3.0",
     "rollup-plugin-sourcemaps": "0.4.2",
     "rollup-plugin-uglify": "3.0.0",