An in-range update of rollup-plugin-commonjs is breaking the build 🚨

Nobody has claimed this yet.

## The devDependency [rollup-plugin-commonjs](https://github.com/rollup/rollup-plugin-commonjs) was updated from `9.2.0` to `9.2.1`.

🚨 [View failing branch](https://github.com/maple3142/vuejs-contextmenu/compare/master...maple3142:greenkeeper%2Frollup-plugin-commonjs-9.2.1).

This version is **covered** by your **current version range** and after updating it in your project **the build failed**.

rollup-plugin-commonjs is a devDependency of this project. It **might not break your production code or affect downstream projects**, but probably breaks your build or test tools, which may **prevent deploying or publishing**.

Status Details

- ❌ **continuous-integration/travis-ci/push:** The Travis CI build failed ([Details](https://travis-ci.org/maple3142/vuejs-contextmenu/builds/497464661?utm_source=github_status&utm_medium=notification)).

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FAQ and help

There is a collection of [frequently asked questions](https://greenkeeper.io/faq.html). If those don’t help, you can always [ask the humans behind Greenkeeper](https://github.com/greenkeeperio/greenkeeper/issues/new).

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Your [Greenkeeper](https://greenkeeper.io) Bot :palm_tree:

Review the Greenkeeper failing branch and the linked Travis CI build first, comparing the rollup-plugin-commonjs 9.2.0 and 9.2.1 dependency states. Determine why the build fails after the in-range update; done means the project’s build and CI checks pass with a compatible dependency version.

Written by the indexing model from the issue text.