Fix "Toggle Fullscreen" not working
Fix "Toggle Fullscreen" not working

win.setFullScreenable() is necessary from Electron v0.36.6.
fix #37

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