Update CHANGELOG.md
Update CHANGELOG.md

Close #411 by upgrading Electron via #459

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