First of all, please read [`CONTRIBUTING.md`](https://github.com/mattermost/desktop/blob/master/CONTRIBUTING.md)

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- [ ] Complete [Mattermost Contributor Agreement](http://www.mattermost.org/mattermost-contributor-agreement/)
- [ ] Execute `npm run prettify` to format codes
- [ ] Update `CHANGELOG.md` and/or `doc/*.md` if it's necessary.
- [ ] Write about environment which you tested
  - Operating system