chore(deps): update dependency rollup-plugin-commonjs to v9.2.1

Author: renovate-bot

package-lock.json

@@ -40,7 +40,7 @@
     "phantomjs-prebuilt": "2.1.16",
     "prettier": "1.16.4",
     "rollup": "1.2.3",
-    "rollup-plugin-commonjs": "9.2.0",
+    "rollup-plugin-commonjs": "9.2.1",
     "rollup-plugin-json": "3.1.0",
     "rollup-plugin-node-resolve": "4.0.1",
     "rollup-plugin-terser": "4.0.4",