Update CHANGELOG.md for file upload dialogs
Update CHANGELOG.md for file upload dialogs

For #497. Fixed by upgrading Electron to 1.7.5 or later

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