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

		this.notificationService.prompt(
			severity.Info,
			nls.localize('updateAvailable', "There's an update available: {0} {1}", this.productService.nameLong, update.productVersion),
			[{
				label: nls.localize('installUpdate', "Install Update"),
				run: () => this.updateService.applyUpdate()
			}, {
				label: nls.localize('later', "Later"),
				run: () => { }
			}, {
				label: nls.localize('releaseNotes', "Release Notes"),
				run: () => {
					this.instantiationService.invokeFunction(accessor => showReleaseNotes(accessor, update.productVersion));
				}
			}]
		);
	}