private static void inform(String latestVersion, boolean quiet) {
		if (!informed && latestVersion != null) {
			if (isNewer(latestVersion)) {
				showMessage(latestVersion);
			} else {
				if (quiet) {
					Util.verboseMsg("jbang is up-to-date.");
				} else {
					Util.infoMsg("jbang is up-to-date.");
				}
			}
			informed = true;
		}
	}
Inform the user if the future returned a newer JBang version number, or
cancel the Future if it isn't done yet.
src/main/java/dev/jbang/util/VersionChecker.java