chore(package): update rollup-plugin-commonjs to version 9.2.0

Closes #26

Author: greenkeeper[bot]

package.json

@@ -92,7 +92,7 @@
     "pump": "3.0.0",
     "raw-loader": "0.5.1",
     "rollup": "^0.63.5",
-    "rollup-plugin-commonjs": "9.1.3",
+    "rollup-plugin-commonjs": "9.2.0",
     "rollup-plugin-node-resolve": "^3.3.0",
     "rollup-plugin-sourcemaps": "^0.4.2",
     "rollup-plugin-uglify": "3.0.0",