Upgrading PicoCLI version and adapting a bit.

tools/asu/build.gradle

@@ -12,7 +12,7 @@ repositories {
 }
 
 dependencies {
-    implementation 'info.picocli:picocli:3.0.2'
+    implementation 'info.picocli:picocli:4.7.5'
     implementation project(':applesingle-api')
 }
 

tools/asu/src/main/java/io/github/applecommander/applesingle/tools/asu/Main.java

@@ -29,7 +29,7 @@ public class Main implements Runnable {
 	
 	public static void main(String[] args) {
 		try {
-			CommandLine.run(new Main(), args);
+			new CommandLine(new Main()).execute(args);
 		} catch (Throwable t) {
 			if (Main.debugFlag) {
 				t.printStackTrace(System.err);