Update CHANGELOG.md for #426
Update CHANGELOG.md for #426

mattermost/desktop,yuya-oc/electron-mattermost,mattermost/desktop,jnugh/desktop,mattermost/desktop,mattermost/desktop,yuya-oc/desktop,yuya-oc/desktop,jnugh/desktop,yuya-oc/desktop,jnugh/desktop,yuya-oc/electron-mattermost,mattermost/desktop,yuya-oc/electron-mattermost