src/vs/workbench/contrib/update/browser/update.ts/UpdateContribution/onUpdateAvailable
class UpdateContribution:	private onUpdateAvailable(update: IUpdate): void {
		if (!this.shouldShowNotification()) {
			return;
		}

		this.notificationService.prompt(
			severity.Info,
			nls.localize('thereIsUpdateAvailable', "There is an available update."),
			[{
				label: nls.localize('download update', "Download Update"),
				run: () => this.updateService.downloadUpdate()
			}, {
				label: nls.localize('later', "Later"),
				run: () => { }
			}, {
				label: nls.localize('releaseNotes', "Release Notes"),
				run: () => {
					const action = this.instantiationService.createInstance(ShowReleaseNotesAction, update.productVersion);
					action.run();
					action.dispose();
				}
			}]
		);
	}